Abstract: This disclosure describes a system for recycling and reusing water from sprinkler systems to water or irrigate a yard or an area of land. The system includes a water reclamation tank that stores water captured from beneath the area of land. When it is time to water the area of land, the sprinkler system draws water from the water reclamation tank. A portion of this water is then recaptured and supplied back to the water reclamation tank for further storage until the next time the sprinkler system is activated. This cyclical process occurs repeatedly and enables a significant reduction in the amount of freshly supplied water used to maintain the area of land.

Abstract: A liquid storage vessel having a base with a bottom and an interior floor; a continuous side extending vertically from the base and having an interior surface, the bottom and continuous side each including an internal layer and an external layer separated by a material barrier and configured such that the interior layers form an inner containment liner, and the external layers form a continuous exterior structural shell enclosing the inner containment liner. A top is affixed to the continuous side and has an interior ceiling. Access to the tank interior is provided by one or more manways. Mounting and connecting structures enable the tanks to be stacked directly atop one another and then structurally connected. The exterior structural shell is fabricated from high performance fiber reinforced concrete, and the inner containment liner is fabricated from a geopolymer concrete blend.

Abstract: A container includes a fire-retarding material, a substantially airtight cavity, and a reinforcement material. The substantially airtight cavity is formed by the fire-retarding material and is sized to hold at least one item. The reinforcement material is connected with the fire-retarding material.

Abstract: A cell for a stormwater management system adapted for retaining or detaining stormwater. The cell comprises a body portion and an internal region. The body portion comprises a plurality of corner columns spaced from each other, a plurality of wall portions, and a window. Each wall portion extends from one of the corner columns to another of the corner columns. Each wall portion comprises an inner surface and an outer surface. The inner surface of each wall portion is curved. The window is through at least one of the wall portions. The window is adapted to permit passage of stormwater into and out of the internal region of the cell.

Abstract: The present invention relates to a subsurface refuse collection system comprising an underground bunker (4), a refuse container (3), a deposit bin (1) and a cover (2) with automatic opening and closing which can be powered electrically using a solar system. The container (3) is collected by means of an automated crane (18) with automatic hitching to facilitate collection. The system is equipped with multiple devices to measure volume and weight of the refuse deposited in the deposit bin (1), for the purpose of system monitoring or improvements to the management of truck routes. It also includes a safety device to prevent accidental fails into the underground bunker during collection.

Abstract: A precast concrete storm water assembly comprised of a plurality of modular precast concrete components is provided. More specifically, a fluid collection and containment system is provided that comprises a plurality of underground modules and permeable devices, such as ground level pavers, to allow the ingress of fluid at a predetermined rate. Various permeable and non-permeable conduits are also contemplated for conveying fluid within the system.

Abstract: In one aspect, a fluid storage apparatus includes a fluid storage tank having a longitudinal axis. The apparatus also includes a channel disposed on an outer surface of the fluid storage tank, the channel configured to receive an anchor strap used to secure the fluid storage tank to a ground surface of an underground installation site.

Abstract: A molded plastic tank, optionally a septic tank, for containing liquid, comprises two injection molded plastic half tanks that have concave exterior walls and integral flanges, and that nest within each other for shipment or storage. Lengthwise ends of the half tanks have grips, for manual or machine lifting of the half tank from the top of a concave-down stack of half tanks, and for then assembling whole tanks. A sling is used to machine lift one or several half tanks by attachment to the grips or to lifting lugs at the top of the half tank. A corrugated septic tank having spaced apart access port regions has a grid of ribs in the exterior top valley corrugations and running across the access port region, to provide strength during testing and use.

Abstract: A filtration tank intended to be buried and for containing wastewater in particular, the tank (100) comprising a casing (110) having an upper part (200) and a lower part (300), the tank being provided with voussoirs (610, 610?) for reinforcing the structure of the casing (110) so that it can withstand the pressure exerted by the surrounding material when the tank (100) is buried and is not completely filled. The voussoirs (610, 610?) bearing against the upper part (200) and in that the tank (100) incorporates means (650d, 670) for absorbing the supporting forces of the voussoirs (610, 610?) so as to transfer said forces onto the bottom (310) of said tank. A tank is thus obtained which withstands being buried without deforming even though it may be only partially filled.

Abstract: A liner, a double-walled tank including such a liner, and a method for retrofitting or creating such a liner wherein the liner is designed to be self-supporting. Specifically, the liner is formed by adding structures to the inner surface of an existing single-walled or double walled tank which project from the inner surface of the tank into the internal volume. The combination of the surfaces of the structures and the remaining inner surfaces of the tank form a modified inner surface which then has a liner placed adjacent thereto. The liner is hardened or other fixed in form to provide for an internal liner which retains negatives of the shapes of the structures and is capable of resisting deformation should the original tank be removed and the liner be filled with material that originally would occupy the tank.

Abstract: Methods and systems for recovering, storing, transporting, and using compressed gas (such as methane gas and conventional Natural Gas) are disclosed. Exemplary methods generally involve transferring gas from a source to a subterranean capacitor and storing the gas in the capacitor and transferring gas from the subterranean capacitor to a transport or refueling tanker.

Abstract: A gasoline storage device, which is regulated to prevent gasoline from vaporizing, and is fabricated from a soft gasoline bag made from soft material that has been processed and coated on both sides so as to be resistant against gasoline and the majority of chemical liquids. The soft gasoline bag can be folded into a small size, directly disposed into a steel gasoline tank and allowed to unfold. Expandable hoses are used to respectively connect to the existing gasoline inlet pipe, gasoline-measuring pipe and manhole of the steel gasoline tank. The soft properties of the soft gasoline bag are used to isolate the gasoline stored within the steel gasoline tank from the air, thereby reducing vaporization of gasoline, pollution and wastage.

Abstract: A container having the shape of a cylinder of a substantially horizontal symmetry axis, closed at its both ends with the bottoms comprising steps in which a body having the form of a pipe empty inside of a corrugated inner surface is manufactured so that a first set of spray nozzles arranged at various angles is introduced into a mold turning around its own axis and then an inner surface of the mold is sprayed, next a hole is cut out for an inspection manhole in the surface of the produced body, then the body is closed with the bottoms at both ends so that a bottom mold is placed at each open end of the body, a second set of spray nozzles arranged at various angles is introduced through the hole for an inspection manhole, and then an inner surface of the bottom mold is sprayed.

Abstract: A wet well design that utilizes recycled material in sectional components to construct wet wells on site is disclosed. Traditional wet well components are made of pre-cast concrete. Green Recycled Material Component Wet Well components are constructed using recycled plastic, recycled steel and recycled Styrofoam. The method described herein for constructing the components and assembling the wet well on site addresses several logistical problems associated with the pre-cast concrete design including reducing project start to completion time, delivery costs, large crane rental costs and power line relocation costs. This design also enables construction of oblong wet wells in medians and other restricted areas as components can be straight or curved sections. Finally, this design eliminates the shifting of traditional cement well components due to uplift from underground water pressure through the use of a new anchoring system. Shifting can result in groundwater intrusion into the well.

Abstract: A sewage tank for use with a pump such as a grinder pump to convey sewage. The sewage tank includes a container comprising a sidewall, and a plurality of members connectable and attachable around an outer surface of the sidewall of the container operable for use in providing additional ballast under high ground water conditions.

Abstract: An injection molded plastic tank for containing liquids, such as a septic tank, is comprised of mated half tanks which are clamped together at mating flanges. A clamp having a C-shape interior concavity has grooves which engage aligned pairs of nubs on the flange surfaces which are spaced apart from the joint surfaces of each flange. A clamp has one or more flared portions at the clamp leading edge end, leading to the grooves or to the inner concavity, to make easier installation of the clamp. When a clamp reaches its home position, the clamp is locked in place against further motion in one or both directions by interacting features on the tank and clamp.

Abstract: A frame assembly for anchoring a containment box with a top opening in a surrounding driveway surface and for removably attaching one of a plurality of different product dispensers to the containment box. The frame assembly includes an anchor frame attached to the top opening of the containment box wherein the anchor frame is configured to be removably attached to any one of a plurality of different dispenser frames and a dispenser frame removably attached to the anchor frame, the dispenser frame including a plurality of frame walls having a frame area larger than an area of the top opening of the containment box such that the frame walls define an offset opening adjacent to the top opening of the containment box, wherein the dispenser frame is adapted to be mounted to one of the plurality of different product dispensers.

Abstract: A brine generating system is disclosed for use with an underground storage tank, the system including a main salt delivery channel that branches into two horizontal feed lines through a reducer to deliver salt under pressure to the bottom of the storage tank in a generally equal distribution along the tank floor. The salt distribution system can be combined with a water distribution system to ensure delivery of water at the location of the salt deposits along the tank floor.

Abstract: During installation and before a floor or foundation slab is put in place, a sewage ejector basin is set below grade and a basin extension of the present invention set in place around the basin. The basin extension of the present invention is rectangular in shape and comprises four basin extension sidewalls in communicable relation to each other at right angles; an opening within a top of the basin extension to allow access to the basin; and an opening within a bottom of the basin extension to accommodate a basin. An inlet pipe is routed underground and into the basin. A discharge pipe and a vent pipe are routed out of the basin and through a basin lid, oriented horizontally in relation to the floor, passed through a basin extension sidewall of the basin extension of the present invention, routed under the floor and toward a wall of a mechanical room.

Abstract: In one aspect, a fluid storage apparatus includes a fluid storage tank having a longitudinal axis. The apparatus also includes a channel disposed on an outer surface of the fluid storage tank, the channel configured to receive an anchor strap used to secure the fluid storage tank to a ground surface of an underground installation site.

Abstract: In one aspect, a method for positioning a fluid storage tank in an underground installation site includes providing the fluid storage tank that includes a measuring device configured to provide a deflection measurement for the fluid storage tank and placing the fluid storage tank in the underground installation site. The method also includes measuring a first value for the deflection measurement from a distance from the measuring device after placing the fluid storage tank in the underground installation site without an operator being positioned on the fluid storage tank, wherein the first value provides a baseline for determining deflection of the fluid storage tank.

Abstract: A waste collection system has an outer shell arranged at least partly underground. A waste container (6) is inserted partly into the outer shell, and has a frame mainly above the ground (8), and a top container (9) mainly above the ground and inside the frame. A bottom container is arranged mainly underground inside the outer shell. The waste container has a cover which opens to emptying the container and one or more filling openings arranged on the cover for introducing waste into the waste container. Lifting means are arranged on the frame, and are engaged by a lifting mechanism (20) so the waste container can be lifted out from the outer shell and emptied and returned. The frame has protrusion(s) (18, 19) toward the inside of the frame and the top container has corresponding recesses (21, 22) which attach the top container to the frame.

Abstract: A safe and environmental protection type underground oil tank can comprise a tank body of two-layer structure comprising an inner tank wall and an outer tank wall, an interlayer space formed between the inner tank wall and the outer tank wall, characterized in thai high porous explosion-proof materials in a plurality of units are respectively filled in a cavity of tank body and the interlayer space formed between the two-layer tank walls. The underground oil tank can also comprise an oil leak detection device being provided in the interiayer space between the two-layer tank walls, and an oil spill pool being established on a manhole cover of the tank body, and the bottom of this oil spill pool being in communication with the interiayer space between the two-layer tank walls.

Abstract: A sewage tank for use with a pump such as a grinder pump to convey sewage. The sewage tank includes a container having an upper portion and a lower tapering portion defining a chamber for containing the pump. The lower tapering portion has a reduced size compared to the upper portion. The upper portion and the lower portion may include a plurality of intersecting vertical ribs and horizontal ribs defining a plurality of recessed pockets. The lower portion of the sewage tank may also include an outwardly-extending flange sufficiently sized so that soil may be backfilled around the bottom of the tank to prevent the tank from floating upward out of the ground due to its buoyancy under high ground water conditions. The sewage tank may also include a stepped flange.

Abstract: A conductive tank sump (100) and a dispenser sump (200) ensuring dissipation of electrostatic charges is disclosed. The sumps (100, 200) which are fully conductive through underground comprising (a) a sump wall made from fiberglass composition impregnated with conductive resin; (b) a ground block (16, 26) secured at the inner surface of the sumps (100, 200); (c) a plurality of pipes mounted through holes provided on the wall of the sumps (100, 200); (d) a plurality of grounding cables (116, 226) connecting the pipes and/or isolated conductors which needs to be earthed to the ground block (16, 26) on the wall of the tank sump/dispenser sump (100, 200). The present invention also relates to method of grounding of the tank sump/dispenser sump (100, 200).

Abstract: A method for manufacturing a tank for storing flammable and combustible liquids underground includes fabricating a cylindrical tank core. Structurally, the core encloses a chamber and has an outer surface. Further, the core includes at least one opening for monitoring the integrity of the chamber positioned on the core's bottom centerline. Also, the tank includes a screen attached to the outer surface of the core along the bottom centerline to cover the opening. Moreover, a foil is affixed to the screen and to the outer surface of the tank core. Sprayed or applied on the foil is a seamless jacket formed from polyurea, thermoplastic, polyurethane or polyamine epoxy to encapsulate the tank core.

Abstract: A foot pedal mechanism for an automated dump station includes a safety release functionality so that when the foot pedal is secured in a closed position and excessive force is applied to the foot pedal, the foot pedal and the locking mechanisms are not damaged.

Abstract: The Invention is an underground storage tank apparatus and method. A buried underground storage tank has a tank sump and a manway defined by a manhole skirt side wall communicating from the surface of the ground to the tank sump. A sediment trap is disposed annularly within the manway and intercepts water and sediment flowing down the manhole skirt wall. An inside wall of the sediment trap is in an annular spaced-apart relation with a tank sump perimeter watt, which together define an annular space interior volume that receives water that overtops the sediment trap inside wall and which receives liquid that overtops the tank sump perimeter wall.

Abstract: A rechargeable battery, such as a 12 Volt battery that is recharged by a solar panel, is placed into a container system that includes an enclosure, having a top portion that is open and a bottom portion that is open, that is substantially buried underground. A sleeve, having a bottom portion that is open and a top portion that is closed, is lowered into the enclosure such that air is trapped inside the top portion of the sleeve when water collects against the enclosure. The trapped air prevents flood water from rising high enough to contact terminals of the battery. When flood conditions subside, the water drains out the bottom portion of the container system into the ground. Additionally, a ridge around the bottom of the sleeve makes it easier to insert the sleeve into the enclosure because the ridge slides over the dirt and debris, but the ridge scrapes and removes unwanted dirt and debris from the enclosure whenever the sleeve is removed to access the battery.

Abstract: A wet well apparatus, and installation method therefore, that includes a cylindrical body extending between a first end and a second end along a body axis defining an interior material holding volume and a base form closing the first end of the cylindrical body to define a base interior volume adjacent the interior material holding volume of the cylindrical body. The base form is configured to receive a flowable fill material in the base interior volume.

Abstract: An additional containment system for a fluid containment vessel includes an outer section, an inner section, and a monitoring system. A plurality of independent and distinct zones of interstitial space are positioned between the outer section and the inner section. The monitoring system is connected to and separately monitors a pressure in each of the zones. A divider plate is attached to both the inner section and the outer section and divides a first zone from a second zone. Upon detecting a leak, the monitoring system provides an indication as to the leak being in the outer section or in the inner section, and upon detecting a leak, the monitoring system also provides an indication as to which of the zones the leak is detected.

Abstract: An underground water storage tank which rarely causes water leakage, and which largely increases an amount of water to be stored therein having an internal water storage sub-tank 11 provided by coating an assembly of water-bearing materials 12 obtained by combining multiple water-bearing materials 12 with one another with a first water-impermeable sheet 14; soil pressure absorption plates 26 provided outside the internal water storage sub-tank 11; and a second water-impermeable sheet 27 for coating the soil pressure absorption plates 26. The water-bearing materials are rigid pipes 12 made of resin and the assembly of the water-bearing materials is formed by mutually and parallel coupling the multiple rigid pipes 12 by pipe coupling means 13 in a state that the multiple rigid pipes 12 are vertically set and arranged at predetermined intervals therebetween in a horizontal direction.

Abstract: A parallelepiped structure (10) comprises interleaved panels (12), each panel being moulded from concrete and being rectangular in plan and comprising a plurality of slots (22) along their top edges (16). The panels can be interleaved in order to provide the structure (10). Tongues (13) between adjacent slots (22) are supported on both sides against movement perpendicular to the plane of the panel (12) by ridges (24a,b) on the supporting panel, and so that the weakness inevitably constituted by them is mitigated. The structure (10) is suitable to accept vehicular loading, while the panels that make it up are still individually light enough to be manipulated by hand. The panels are moulded in moulds assembled from blow-or vacuum-moulded sheets placed together in a sandwich.

Abstract: A water tank T of plastic material which is joined by using at least two open and identical tank parts 1 and a joining plane 2, the tank parts having respective opening structures R with a flattened inner opening edge, a sealing channel 26 being open towards the joining plane, and an outer flattened opening edge, the inner and outer opening edges within the opening edge structure are situated in each tank part 1, 35 in the joining plane 2, the opening edge at the same time defining inner and outer fitting surfaces 16, 17, respectively with a width exceeding the thickness X of the tank part wall 30 and the sealing channel wall 34 by at least about the half, such that the water tank T selectively can be manufactured from the same tank parts 1, 35 either monolithically by welding the fitting surfaces 16, 17 without sealing means in-between to each other or separable by clamping the opening edge structures R from the outer side with sealing means 33 provided between both tank parts 1, 35.

Abstract: The present invention provides a safe, environmental protection, energy-saving type oil-filling device which at least consists of a double-wall oil-storage tank. The separating explosion-proof materials are respectively filled in the tank inner cavity and the tank wall interlayer. The oil outlet pipe of the oil-storage tank is connected with the oil-filling machine. A skid body is set up under the oil-storage tank and the oil-filling machine. A hood body is set up on the skid body. The oil-filling machine is a split type oil-filling machine, which consists of a digital electronic display, an oil pump case body and a filling gun. The digital electronic display and the filling gun are set up on the outer side of hood body wall. The oil pump case body is set up in the space formed by inside of the hood body and outside of the oil-storage tank and fixed on the skid body. The oil outlet pipe of the oil-storage tank is connected on the oil pump case body.

Abstract: An inspection chamber having a plastic sleeve, a plastic base accommodated in the sleeve and at least two branches connected to the sleeve, which base has a flow profile that extends between the two branches. The base is made up of at least two separate base parts that are permanently fixed to one another at their edges facing one another, such as by welding, fusing, gluing and the like.

Abstract: What is described is a plastic container consisting of two container parts (12, 14) which are connected to one another in an opening region. Each container part (12, 14) has a single connection frame (26, 28) which includes the connection opening. The container parts (12, 14) can be connected to one another along the facing connection frames (26, 28). At least one connection frame (26, 28) includes a support device (30, 34; 54) which extends in the connection frame (26, 28) in the vertical direction.

Abstract: The Invention is an underground storage tank apparatus and method. A buried underground storage tank has a tank sump and a manway defined by a manhole skirt side wall communicating from the surface of the ground to the tank sump. A sediment trap is disposed annularly within the manway and intercepts water and sediment flowing down the manhole skirt wall. An inside wall of the sediment trap is in an annular spaced-apart relation with a tank sump perimeter watt, which together define an annular space interior volume that receives water that overtops the sediment trap inside wall and which receives liquid that overtops the tank sump perimeter wall.

Abstract: A wet well apparatus, and installation method therefore, that includes a cylindrical body extending between a first end and a second end along a body axis defining an interior material holding volume and a base form closing the first end of the cylindrical body to define a base interior volume adjacent the interior material holding volume of the cylindrical body. The base form is configured to receive a flowable fill material in the base interior volume.

Abstract: A catch basin configured to allow selective positioning of the outlet and inlet ports on the side walls of the catch basin's receptacle body. At least one of the receptacle side walls comprise a slide opening having opposing sides. A slide member has a pair of slide edges that slidably engage the sides of the slide opening to substantially close the slide opening. The slide member has a port section and two or more positioning sections, with at least one positioning section located above the port section and one below the port section. The port section has an outlet or inlet port integral therewith or fixedly attached thereto or the port section comprises a mechanism for attaching an outlet or inlet port thereto, such as a port cutout having a removable knockout plate. The slide member has section removal indicators to identify which positioning sections should be removed.

Abstract: A method for manufacturing a tank for storing flammable and combustible liquids underground includes fabricating a cylindrical tank core. Structurally, the core encloses a chamber and has an outer surface. Further, the core includes at least one opening for monitoring the integrity of the chamber positioned on the core's bottom centerline. Also, the tank includes a screen attached to the outer surface of the core along the bottom centerline to cover the opening. Moreover, a foil is affixed to the screen and to the outer surface of the tank core. Sprayed or applied on the foil is a seamless jacket formed from polyurea, thermoplastic, polyurethane or polyamine epoxy to encapsulate the tank core.

Abstract: A tank has a pair of elongated, generally parallel, and hollow plastic chambers having longitudinally extending side walls and closed ends, and a transverse plastic connector tube having one end connected to and opening into one of the elongated chambers and an opposite end connected to and opening into the other of the elongated chambers.

Abstract: In a tank B for water treatment, consisting of at least two plastic material tank parts 1, 2 produced by injection moulding or by injection moulding and embossing a separately produced separation wall T is mounted with the edge at the walls of the tank parts such that the mounting regions at least partly are watertight. The separation wall T extends in the tank B crosswise to the joining plane E. The tank parts have opening edge structures R which fit on each other and which are joined in the joining plane E in watertight fashion.

Abstract: The present invention relates to an underground reservoir for storing liquid products comprising an inner or main reservoir made from a material having known strength characteristics, such as a carbon steel typically used in the industry, and an outer or secondary reservoir comprising a coating, said coating comprising an iinner layer made from an impervious paper and an outer polyurethane-based layer. The present invention also relates to a process for manufacturing said reservoir.

Abstract: An integrally formed riser pan member for use as a modular component within an access passageway for an on-site waste disposal system, such as a septic tank, to receivably retain a secondary cover member within, the riser pan member including a cylindrical body having an upper portion having a vertical wall member adapted to receive another modular passageway component thereon, and a lower portion which includes an integral pan portion to seatably receive a secondary cover member. The riser pan member further includes an annular ring between the upper and lower portions. The riser pan member can be employed as a lowermost, a highermost, or as an intermediate component in, for example, an access passageway formed of multiple stackable riser members. In addition, the riser pan member may be formed integrally with a stackable riser member.

Abstract: An additional containment system for a fluid containment vessel includes an outer section, an inner section, and a monitoring system. A plurality of independent and distinct zones of interstitial space are positioned between the outer section and the inner section. The monitoring system is connected to and separately monitors a pressure in each of the zones. A divider plate is attached to both the inner section and the outer section and divides a first zone from a second zone. Upon detecting a leak, the monitoring system provides an indication as to the leak being in the outer section or in the inner section, and upon detecting a leak, the monitoring system also provides an indication as to which of the zones the leak is detected.

Abstract: An improved underground water storage tank having a joined-doughnut (multiple-torus) configuration, preferably a double torus although single, triple, quadruple and other toroidal configurations are possible. The concept entails a lateral merger of two or more toroidal tank sections in a multi-compartment double, triple, or greater-toroidal configuration with one or more cylindrical access ports traversing the tank orthogonally at the area of merger or along the perimeter. The tanks may be unitary as formed by rotational-molding or blow-molding. The laterally-joined torus sections increase the structural strength of the tank so that the need for reinforcing ribs or internal supports is substantially eliminated. The strength of the torus-configuration allows the tank to be buried below the frost line, and the elimination of molded ribs avoids trapped fluid or so that nearly all tank capacity can be utilized.

Abstract: The present invention relates to a plant for storing gas under pressure. Said plant comprises at least one basin (4) filled with a liquid (5), one or more pressure vessels (1) located in said basin for storing said gas including interconnecting piping and connections (2) to a gas supply and a gas discharge network, an anchoring system (3) for supporting said vessels, a cover with a slanted surface on the underside (6) for covering said basin which will lead any gas leak occurring in said basin towards and through a vent (7), and at least one gas detection equipment (9) located in said vent. The plant is especially suitable for storing compressed gaseous hydrogen and can be connected a hydrogen fuel replenishment system.

Abstract: An underground storage tank riser assembly comprises a riser member and at least one riser alignment spacer assembly. The riser member comprises an inferior riser end and an outer riser surface. The outer riser surface at the inferior riser end comprises a plurality of paired, optionally color-coded, curvilinear score indicia. The curvilinear score indicia enable a user to remove paired inferior end portions from the inferior riser end for forming a tank-engaging, saddle-shaped mouth at the inferior riser end. The saddle-shaped mouth comprises a vertical riser radius of curvature substantially equal in magnitude to a determinable tank radius of curvature. The saddle-shaped mouth is engageable with an outer tank surface in radial adjacency to a conduit extending therefrom. The riser alignment spacer assembly functions to center the riser member relative to the conduit.

Abstract: A septic system tank vertical wall has vertically overlapping grooved rings having specific diameters for receiving existing sealing couplers for septic system pipe. One wall of the groove has portions at different angles from the wall. The grooves are at the same depth and discontinuous at their intersections.