Abstract: The present invention relates to apparatus this is particularly, but not exclusively, suited for use as a mud bucket in the oil and gas industry. The apparatus includes a seal that seals the mud bucket to a tubular (e.g. a stand of drill pipe). The seal is attached to the mud bucket via a quick release mechanism so that worn-out or damaged seals can be replaced quickly.

Abstract: In a fuel tank (1) with a plug which is to be opened, in particular, during maintenance work, a plugging part (6) is fastened in a trough-like depression (2) of the wall of the fuel tank (1) by means of a nut (7). The nut (7) has a thread (9) intended for tapping into a bead (5) of the fuel tank (1). As a result, the fuel tank (1) can be manufactured particularly cost-effectively from geometrically simple parts.

Abstract: A treatment tank for a water conditioning apparatus has a tank head with a wall, a rim defining a through hole in the wall and a tank ring fixed to the rim. The tank ring is coaxial with the tank head and extends generally axially. The tank also has a generally cylindrical flange defining a nipple portion with a peripheral wall that has a lower edge. The flange also has a shoulder extending radially from the nipple portion with a top surface and an outer peripheral wall extending downward from the top surface. A fastener assembly is engageable on the top surface of the shoulder for securing the flange on the tank head through contact between the fastener assembly and the tank ring.

Abstract: A manway assembly (10) designed for mounting within an opening (19) in a vessel wall (20) is provided which includes a manway ring (12) having a passageway (24) therethrough, with an inner cover (14) and a cover lock (18). The cover (14) is supported by a swing mount (16) including a tubular member (42), an arm (44) telescopically received within member (42), and a suspension connector (48). The lock (18) is made up of studs (38) secured to cover (14) and extending through passageway (22), with an annular locking plate (50) having bores (54) for receiving the studs (38); nuts (64) complete the locking arrangement.

Abstract: A manway assembly (10) designed for mounting within an opening (19) in a vessel wall (20) is provided which includes a manway ring (12) having a passageway (24) therethrough, with an inner cover (14) and a cover lock (18). The cover (14) is supported by a swing mount (16) including a tubular member (42), an arm (44) telescopically received within member (42), and a suspension connector (48). The lock (18) is made up of studs (38) secured to cover (14) and extending through passageway (22), with an annular locking plate (50) having bores (54) for receiving the studs (38); nuts (64) complete the locking arrangement.

Abstract: A impact resistant, sealable canister is provided comprising a wall structure having a lower edge portion joined to a base. A receiving collar is joined to an opposing top edge portion of the wall structure. The receiving collar includes an annular channel and an inner shoulder having fastener pads. The pads have fastener openings and stationary connector elements. A container lid releasably seals against the collar by operation of fastener parts retained in the lid that engage the collar connector elements. Gasket materials adjacent the collar periphery and around the fastener parts function to provide a reusable sealed canister useful for water activities and other outdoor involvements.

Abstract: A vibration dampened fuel tank assembly includes a fastener system and a fuel tank having integrated retention areas for horizontal and/or vertical retention to a fixed surface. Each retention area includes an access area that leads to a mounting lip having a semi-annular opening for receipt of the fastener system. The fastener system preferably includes a bolt-like member, a compression surface and a vibration dampening member, wherein the vibration dampening member has a first and a second diameter such that the first diameter fits within the mounting lip opening while the second diameter overlies the mounting lip. When mounted, the fastener system is engaged to the mounting lip of the fuel tank and affixes to a fixed surface such as a floor or sidewall. The fuel tank assembly, thereby, effectively secures the fuel tank and dampens the repetitive vibrations typically associated with the dynamic watercraft environment.

Abstract: A sealing cap for pressurized gas containers, in particular for 500 kg chlorine containers, has at least two, preferably four, retaining claws, which engage in an existing bead on the pressurized gas container and effect the sealing. The retaining claws are connected to the sealing cap via a rod having a mount, the rod, at the opposite end, having a screw thread with a lock nut. A seal of resistant material is advantageously guided in a groove of the sealing cap. Furthermore, the sealing cap may have a pressure gage, a discharge valve and handles.

Abstract: A case locking arrangement mainly comprising two half casings whose apertures are provided opposite to each other, wherein a flange is disposed around the aperture rim of said half casing, at prearranged position of which a number of engaging seats are provided, and wherein at least one locating post upwards extended is provided on the bottom surface of said half casing, at the end of which a screw hole is disposed, and wherein said half casing has an engaging projection and a connecting seat corresponding to said engaging seat and said locating post, and wherein the connecting seat contains a fish eye hole therein.

Abstract: A disconnectable flow connector for connecting a fluid-containing flexible bag (1) to a fluid supply line (100) is sufficiently airtight so as to allow dispensing of fluids, especially adhesives, which are highly reactive on contact with even the least quantity of air. The bag (1) has a spout (2, 3) with a pierceable membrane (5). A valve (10) has a tapering end which can pierce and then seal the membrane, an aperture (13) at the tip, and a valve plunger (14) operable so as to be retractable from the aperture (13) to an open (fluid flow) position independently of the piercing action. A fluid pressure mechanism is provided for driving fluid from the flexible bag (1) through the flow connector to the fluid supply line (100). The mechanism consists of a housing (30,31,32,33) for containing the bag (1) and a housing end wall (34) which is moveable along the length of the housing. The bag (1) has no tendency to collapse or fold in on itself.

Abstract: A rectangular housing including a frame, which forms the side walls, a plate fastened on the frame and a door on the frame. On the side facing the plate, the frame includes an undercut groove which is open toward the plate. The groove is bounded by a closing web pointing toward the plate, a center web extending parallel to the plate and a side web extending approximately perpendicularly to the plate. On its side facing the frame, the plate includes a surrounding seal which rests on the front edge of the closing web. The plate is fastened to the frame by several fastening screws.

Abstract: A thermal pot comprising a barrel member; a vacuum vessel disposed within the barrel member and comprising a neck member; a lid mounted on an upper side 66 the neck member; a screw fastening device provided between the barrel member and the neck member; and fixing device for fixing the state of the screw fastening with the screw fastening device by inserting the neck member in the barrel member horizontally at a part of the neck member and barrel member which are overlapped, thereby to prevent the screw device from being exposed so that the lid is securely fastened while the overall design is improved.

Abstract: A mechanism for selectively securing a cover to a flange of a pressure vessel. The cover and flange each have openings that are aligned when the cover is in position facing the flange. The mechanism includes an anchor plate having a hole therethrough. A piston is slidable in a direction normal to the cover in alignment with the opening therethrough. A stud extends from to the piston with a stud head remote from the piston. The stud head fits through the opening of the closer of the cover and flange and through a wider portion of the anchor plate hole, and is positioned opposite the flange and cover from the piston when the cover is positioned over the flange. The stud head does not fit through a narrower portion of the anchor plate hole. A resilient member biases the piston away from the cover. A selectively activated actuator overcomes the resilient member and forces the stud head away from the flange and the anchor plate.

Abstract: A pressure vessel is provided for observing corrosive fluids at high temperatures and pressures. A transparent Teflon bag contains the corrosive fluid and provides an inert barrier. The Teflon bag is placed within a sapphire tube, which forms a pressure boundary. The tube is received within a pipe including a viewing window. The combination of the Teflon bag, sapphire tube and pipe provides a strong and inert pressure vessel. In an alternative embodiment, tie rods connect together compression fittings at opposite ends of the sapphire tube.

Abstract: A removable sealing plug device for protecting the interior of a refrigerant compressor from dust, dirt, and corrosion during storage and/or transport of the compressor before it is assembled into a refrigerating system, including a plug element made of a rubber material and having a body portion suitable for being sealingly fitted in an inlet and/or outlet port of the compressor and a columnar head portion formed in an upper face of the body portion, and a base plate having a through-hole in which the columnar head of the plug element is press-fitted, the through-hole of the base plate being provided with sawtooth-like projections to non-removably hold the columnar portion of the plug element and secure it to the outer portion of the compressor, by using an existing threaded hole and a screw bolt, to hold the plug element between the base plate element and the outer circumference of the compressor.

Abstract: A pressure vessel includes a polyolefin extruded tube, a polyolefin flange overmolded onto the tube, and a cap engaged to the flange. In the overmolding process, a polyolefin material is overmolded unto a polyolefin substrate.

Abstract: 216-type screws and KS-type screws are two types of fastening devices typically used to restrict access to the chambers of building entrance protector (BEP) enclosures used in telecommunications applications. Access to such chambers is limited to those users who have special tools designed for one or the other type of screw. The present invention is a screw that can be actuated using either the special tools designed for 216-type screws or the special tools designed for KS-type screws. In particular, screws of the present invention have a hexagon-shaped outer surface like a 216-type screw and a hexagon shaped recess with a cylindrical upstanding post in the middle of the recess like a KS-type screw.

Abstract: A high vacuum housing with a first and second housing part and in which the housing parts are secured together to form an interior housing chamber. In order to seal the housing parts, an annular outwardly extending sealing ring having a flat radial surface is formed on one of the housing parts. An annular alignment recess is formed on the other housing part which registers with and receives the alignment ring. A thin walled seal is disposed between the housing parts. When the housing parts are secured together by bolts, an outer periphery of the seal is compressibly sandwiched between the flat radial surface on the sealing ring and the flat surface on the second housing part thus sealing the window to the housing.

Abstract: The top (2) of a sheet metal container (1) for the transportation and storage of liquids has a central fill opening (3) which is edged by a neck (5) which is perpendicular to the top surface (4) of the container. A plastic or metal ring (6) with an external thread (7) is pressed down against the top surface (4) by the upper edge (8) of the neck (5). The neck is swaged outwardly. The threaded ring (6) is protected against rotation by form-fit connections on the neck (5). A plastic screw cap (11) into which a disc-shaped insert (12) of special steel is pressed, is screwed onto the threaded ring (6). Between the outside edge (13) of the cap insert (12) and a ring projection (14) of the latter, an annular groove (15) for holding a gasket (16) is molded into the insert, and by this gasket (16) the screw cap (11) is sealed against the upper edge (8) of the neck (5).

Abstract: A waterproof container is provided including a housing formed of an elastomeric material defining an interior space with an open top having a planar top peripheral edge. An interior lining of the housing is constructed from a foam material. The lining is situated within the interior space of the housing for protecting the contents thereof. Further provided is a cover having a planar rectangular configuration with a top face, a bottom face, and a periphery formed therebetween. The bottom face of the cover has a cut out with a rectangular cross-section formed adjacent the entire periphery. The cut out has a width equal to a thickness of the faces of the housing. The cover further has a planar bottom lining constructed from a foam material situated on the bottom face of the cover. Next provided is a gasket having a planar rectangular configuration and a width equal to the thickness of the faces of the housing. A coupling mechanism is included for selectively securing the cover to the housing.

Abstract: A cover plate for fluid pumps incorporating an O-ring seal 5 secured in a channel 4. The cover includes slots 7 extending to the edge of the cover plate and securing holes to allow easy positioning of the cover onto bolts which remain located in the body of the pump. These and other securing bolts 8 may have large and knurled heads for rapid finger-tightening so as to avoid the need for tools.

Abstract: An enclosure module is provided for use in holding a variety of components or functioning as an appliance housing. The module is square in shape, and has a bottom backplate circumscribed at its perimeter by four identical sidewalls extending outward therefrom. Each sidewall forms a wireway opening at a point about the central axis of the module, and supports both a shallow alignment boss to one side of the central axis and a shallow alignment slot. Both the alignment boss and the alignment slot are vertically placed, are at equal heights, and are placed equidistant from the central axis. In such a configuration it is intended that when two identical enclosure modules are placed adjacent, the alignment boss of a first module will align with engage to the alignment slot of a second, adjacent module such that the wireway openings become aligned in a mutually accessible manner.

Abstract: An electrical enclosure lid composed of several elongated members nested in such a way that a tortuous air channel is created between each member. The air channel allows heat generated by internal electrical components, such as large power transformers, to pass out of the lid to facilitate convection cooling of the enclosure. Due to the labyrinthine air channel, flames potentially generated inside the enclosure are hindered from passing outside the enclosure. Drainage holes are included on the sides of the lid to allow water to pass over the lid without entering the enclosure. The design is optimized for harsh environments such as a mining operation where large amounts of power are needed in close proximity to workers. The nesting structure provides strong structural support to protect the enclosure in case of a rock fall or a cave-in.

Abstract: A monitor case assembly includes a front case section to which a cathode ray tube is fixed; a rear case section fastened to the front case section; and an intermediate case section interposed between the front and rear sections for reenforcing the case and preventing distortion in the case due to the weight of the cathode ray tube. The monitor case assembly also providing a more visually appealing exterior appearance.

Abstract: An enclosure and latching structure for the cable compartment of a tank for a padmounted distribution transformer. The enclosure is of non-conductive fire resistant material. A curved latch arm of non-conductive material is pivotally connected to support structure mounted on the front tank panel of the transformer above the midpoint thereof. The enclosure is shaped to conceal the cable compartment of the tank and is open at the back for engaging the periphery of the tank panel. The enclosure has an opening in the front adjacent the top thereof through which extends a locking device secured to the enclosure for mating with locking structure carried at the free end of the latch arm.

Abstract: An underground storage container for the storage of personal valuables and possessions to protect such items from theft, fire, riots and natural disasters. A generally cylindrical tapered container, made preferably of fiberglass, is hermetically sealed through the employment of seals and a cover designed to mate with corresponding flanges on the upper portion of the container's body. The underground storage container has a vacuum release mechanism to facilitate opening and closing the container and a raised spiral auger around the base of the container to assist in anchoring the underground storage container and facilitating its extraction upon removal.

Abstract: A safety hatch for tanks, washing machines, industrial machines and the like comprises a frame and an arm having a first end pivotally connected to the frame. A second end of the arm has a surface portion provided with a hole having a circular section communicating with a slot section which extends to an external edge of the arm. A male threaded member is dimensioned to extend through the arm hole and has a first end pivotally connected to the frame and a second end. A female threaded member is adapted for threaded engagement with the male threaded member and has a head section and a shank section. A clamping member is integrally connected to the shank section of the female threaded member and has a tubular portion extending from the shank section.

Abstract: An improved electrical outlet box assembly includes an outlet box and a cover. The outlet box includes a bottom wall and a sidewall perimetrically bounding the bottom wall and an open upper end. The sidewall supports a pair of diametrically opposed ear lugs. Each ear lug has a pair of ears integrally formed therewith extending inwardly into the interior of the box. The ears secure a fastening element. The cover is removably frictionally engagable with the box and provides a closure for the open upper end of the box. The cover includes a generally planar surface with a pair of diametrically opposed dome-shaped protrusions extending from the top surface of the cover. The protrusions are positioned on the cover such that they align with the ears and accommodate the fastening elements therein. The cover further includes a pair of locking members extending from the bottom surface of the cover and which are frictionally engagable with the ears thereby holding the cover onto the outlet box.

Abstract: Disclosed is a containment system for shipping and handling probe card circuit boards. The containment system features a base member equipped with a recessed seating shelf for receiving and supporting the probe card, and a set of fasteners to hold the probe card securely in place. The base also has a second, upper-level, seating shelf to support a cover, and a second set of fasteners to hold the cover in position to seal the base and further secure the probe card in place.

Abstract: A hermetically sealed case, has a space between a top case and a bottom case which can be completely sealed by means of a waterproof packing, and in which an area around a connecting cable is completely sealed. A first case having an annular projection formed at the periphery thereof is assembled to a second case having an annular groove having a shape corresponding to that of the projection of the first case formed at the periphery of the second case. An elastic member is provided between the projection of said first case and the groove of said second case. The width of said projection is smaller than the width of said groove, and said projection is fitted within said groove in a transverse direction. The elastic member deflects toward the groove, that is, deflects such that the ends of the elastic member are drawn toward the projection. Line contact is established between the corners of the projection and the elastic member, and also between the corners of the groove and the elastic member.

Abstract: An assembly for prepping sulfuric acid for spectrometric analysis comprised of a vessel member having sleeve members formed with channels disposed about an outer peripheral surface and a cap member including a disc shaped top portion and a lower body portion and further including a gasket member to be positioned between the cap member and the vessel member wherein the lower body portion extending into a chamber of the vessel member and wherein the top portion includes channels to be aligned with the channels of the sleeves of the vessel member for receiving mounting devices for rigidly mounting the cap member to the vessel member.

Abstract: Apparatus and methods of closing and sealing chemical reactor vessels, which are relatively less susceptible to contaminant build-up and more easily maintained in such a state.The chemical reactor vessel comprises a vessel body and a separable head attached thereto wherein the means for attaching and sealing said head to said body comprises; a seal means, a flange means, a shield means and an attachment means.The seal means functions, in compression, to prevent leakage of fluids into and from said chemical reactor vessel. The flange means functions to impose compressive loads to the seal means to cause the seal means to prevent leakage of fluids into and from the chemical reactor vessel.

Abstract: A device for housing toxic waste or toxic munitions including a vessel having a body flange and a removable cap that interfaces with the body flange to make a hermetic seal. A primary and a secondary O-ring are positioned between the cap and the body flange to ensure a leak-proof seal having an integrity of 1.times.10.sup.-6 He/sec at one atmosphere at standard temperature and pressure (STP).

Abstract: A unitary, one-piece cooler cap for evaporative coolers comprising an integral shell and molded insulation. The shell provides seating and mounting structure, as well as a mold cavity.

Abstract: A device to be applied to the top of a metallic container after the top of the container has been completely or partially removed for the purpose of preserving the unconsumed contents of the container. The device includes a seal which is adapted to fit the contour of the top periphery of the container is sealed in place utilizing at least one locking device.

Abstract: Apparatus for holding materials including a container having a container wall, a non-circular container opening extending through the container wall, a non-circular container flange connected to the exterior of the container wall and surrounding the container opening. A non-metallic, non-circular access hatch connectable to the container flange by bolting and having a plurality of apertures extending therethrough is provided. The non-metallic, non-circular access hatch preferably includes a primary opening having a removable cover and a variety of associated components being accommodated by respective apertures such as a recirculation line, a pressure relief valve, a vacuum relief valve, and a fluid level indicator. Preferably the hatch apparatus and the primary opening cover are made of an ultra high molecular weight polyethylene material.

Abstract: A system for mounting access plates for covering an access opening onto storage tanks and the like. A backing plate assembly comprising two semi-circular, rigid backing plates is provided. The backing plates are passed individually into the interior of the tank where the backing plate assembly is reconfigured. The backing plate assembly located within the interior of the tank provides a solid structure that can be used to anchor the access plate onto the tank wall over the opening. Interior and exterior gaskets are used to create a fluidtight seal around the opening and to facilitate assembly of the mounting assembly.

Abstract: A high pressure stop kit for a valve assembly such that an inspection port can be sealed. The kit includes a plug to be screwed into the port and an over-plate secured to that plug. The interface between the plate, plug and port secured to that plug. The interface between the plate, plug and port wall being sealed by a gasket `O` ring or other appropriate sealing means held in necessed sections.

Abstract: An apparatus for holding materials comprising: a container including a container wall and having a first container opening extending through the container wall; a first container flange connected to the exterior of the container wall surrounding the first container opening; and a non-metallic blanking hatch connectable to the first container flange by bolting. The non-metallic blanking hatch has a plurality of apertures extending therethrough which provide access to the interior of the container.The inventive apparatus preferably also comprises: (a) a second container flange connected to the exterior of the container wall and surrounding a second container opening extending through the container wall and (b) a non-metallic manway hatch connectable to the second container flange.

Abstract: A covered conduit box includes a cover which maintains screws, used to fix the cover to a base member of the box, captive, when the cover is disengaged. The cover includes stepped screw bores therein which allow the screws to cock slightly relative to the cover, to engage in mating channels provided in flanges on the base member, the flanges being angled away from the cover to provide a torque upon the screws, maintaining engagement between the cover and the body. The stepped screw bore maintains the screw captured within the bore unless pressure is applied against the end of the screw to cause a thread thereof to interact with sidewalls of the bore, at which point the screw can be disengaged from capture therein.

Abstract: An air bag device is provided including an air bag 1, an inflator 5, and a casing 7 including an upper case member and a lower case member, surrounding the air bag and the inflator. The lower case member 16 and auxiliary plates 18 form fitting recesses 17 at the connecting portion 16a of the lower case member which open upwardly. Tongue pieces 10 are formed at the connecting portion 9a of the upper case member near the gas jetting outlets 6 of the inflator in such a manner that they are extended downwardly from the upper case member. The tongue pieces 10 are inserted into the fitting recesses 17 to form the casing. The auxiliary plates 18 are pushed against the tongue pieces 10 by the pressure of gas jetted from the gas jetting outlets 6.

Abstract: A smoke-detector security cover has a toroidal base plate attachable to a wall or ceiling surrounding a smoke detector. A toroidal cover plate having a plurality of retainer appendages extended inward radially is connected to the toroidal base plate to cover portions of the smoke detector circumferentially external from a central smoke-detection section of the smoke detector. Attachment rods are extended perpendicularly from the base plate towards the cover plate. Attachment sleeves are extended perpendicularly from the cover plate in sliding contact with the attachment rods telescopically. An anti-theft fastener means is provided in fastener relationship between at least one attachment rod and one attachment sleeve. The anti-theft fastener means can be a split attachment bolt that is tightened in an attachment sleeve with a tapered fastener head or tapered fastener shank. The fastener has an anti-theft head. The anti-theft head can be recessed to further deter unauthorized removal.

Abstract: A bulk storage tank is disclosed having an access opening in a lower funnel portion with a removable cover plate. The access opening is located and shaped for permitting a workman to access or partially enter the interior of the tank.

Abstract: A radiation-shielding storage/transport container has a cast-iron vessel having an open end defining an end face, a steel ring engaging the end face and forming at least one annular seat, a weld unitarily bonding the ring to the end face, and a cover secured to the steel ring in the seat thereof. The cast-iron vessel is formed at its open end with an annular seat having a shoulder surface forming the end face. The weld is an aluminothermic weld that extends over the entire surface of the interface between the ring and the vessel. The ring is formed with two such seats and the cover includes an inner plug cover and an outer cover each in a respective one of the seats. The outer cover is of steel and a second peripheral weld connects the outer cover to the respective seat.

Abstract: The invention teaches apparatus suited for holding highly corrosive solvents heated under sealed conditions to temperatures up to 500.degree. C., for even extended durations. The apparatus is in the form of an open top vessel having a removable cover therefor, a seal cooperating between the vessel and cover, and clamping structures isolated radially beyond the seal from the vessel contents to hold the cover and vessel sealed together. The vessel and cover can be made structurally of chemically resistent material, such as a nickel alloy; or can be made as a separate chemically resistent liner, cover and seal structure contained within an outer pressure shell and cover, and clamping structures. The liner, cover, and seal would be formed of chemically resistent tantalum (Ta), platinum (Pt) or polytetrafluoroethylene. Gem-quality diamonds can be refined by using different related vessels exclusively to hold respective caustic, acid and rinse solvents, and moving the diamonds from vessel to vessel sequentially.

Abstract: A portable remote control panel of variable size comprises a series of modular housing meanders each having a compartment adjustable in size for receiving a respective remote controller, an operating window at an operating face, and a control beam-admitting window at a leading end. The housing members are releasably linked together locating individual remote controllers arrayed in side-by-side relation with control buttons thereof exposed at the respective windows at the operating face and with the leading, beam-emitting ends aligned with the respective beam-admitting windows.

Abstract: An end closure fabrication for a generally cylindrical non-metallic pressure vessel having an opening at one end thereof which includes a collar which is adhesively bonded to sides of the vessel adjacent to the open end of the vessel. A circular end pressure plate equipped with an annular seal is inserted in the end of the vessel and an end cap to secure the pressure plate is attached over the collar.

Abstract: A brewing container particularly for use in the making of beer, wherein the container includes a container lid received upon an uppermost end of the container, having an annular flange, with the annular flange including securement rods arranged for reception through the flange for fixed securement of the lid to the flange. An outlet valve mounted in adjacency to the floor of the container permits selective flow of fluid from within the container subsequent to brewing procedure.

Abstract: A closure member for sealing an opening for a cavity in a housing to prevent fluid from being communicated to the surrounding environment. The closure member has a shaft with an end member having a irregular radial surface thereon. A first torque is applied to the irregular surface to move threads into corresponding threads in the housing to join the closure member to the housing. A self locking fastener has as stem with threads that extend from a head that engages the housing when a second torque is applied to the head. A washer retained on the stem engages the irregular surface and deforms as the second torque is applied to the head. The deformation prevents relative rotation to thereafter occur between the closure member and housing to assure that the opening in the cavity remains sealed.

Abstract: A humidifier unit is used with a forced air heating system and includes a water reservoir, a water inlet connection to the reservoir, control means for maintaining the water level at a predetermined depth, and a heat exchanger for heating the water to produce steam. This reservoir has a removable top plate for closing the open top defined by the upper edges of side and end walls. Horizontal flanges extend inward from the upper edges of the reservoir side and end walls and act as a gasket base. Lips extend upward from the inner edges of those horizontal flanges and act as an internal horizontal gasket retainer. Finally, flanges depend from all sides of the top plate and are positioned to surround the upper edges of the side walls and to act as an external horizontal gasket retainer.