Abstract: The fuel filter housing (12) is formed of inlet segment (14) and outlet segment (16) that are telescopically mounted to each other, with a seal (44) positioned between the mounting flanges (38) and (40). Valve (60) is maintained displaced from its valve seat (58) by valve actuator (66), by the valve actuator engaging the perimeter of the filter (34). When the outlet housing segment (16) moves away from inlet housing segment (14), the filter and the valve actuator (66) also move, allowing the valve the close. The amplitude of movement of the valve (60) toward and away from its seat (58) is smaller than the sealed telescopic movement of the housing segments, so that the valve closes before the segments separate, thereby limiting the amount of fuel lost from the fuel filter assembly.

Abstract: A high pressure filter cap configured to withstand a high pressure differential and to minimize the deposit of residue on the filter cap threads. The body of the cap has, protruding from its lower surface, two circular flanges concentrically arranged about a central axis. The outer flange is threaded on its inner surface to engage the threads of a filter housing. The inner flange accommodates, on its outer surface, a sealing component such as an o-ring. A retainer, removably attached to the cap, holds the sealing component in place.

Abstract: A filter cartridge assembly intended for replaceable installation in a demountable cartridge housing includes in one embodiment, a retaining ring that is attached to the product water tube of the filter cartridge, is inserted with the cartridge into the housing, and is locked to the housing such that, upon subsequent removal of the housing to change the cartridge, the cartridge will be forced from sealing engagement with the end cap header and caused to remain in the housing until the housing has been removed. The integral retaining ring and cartridge are then simply unlocked and removed from the housing for replacement. Brine ring embodiments that are welded to the housing or attached to the housing with a snap-in connection are also disclosed.

Abstract: A filter has a longitudinal axis with an inner diameter defined by a hollow longitudinally extending center. The filter has fingers extend radially outwardly arcuately from the longitudinal axis. The fingers have base ends near the longitudinal axis and outer edges at extremities spaced from the longitudinal axis. The outer diameter of the filter is defined by the outer edges of the fingers. The filter is formed from a sintered porous molded thermoplastic or another material resulting in a filter more rigid than standard filters. The fingers are spaced apart from one another a predetermined, substantially fixed distance to form slots therebetween sized to capture contaminants therein.

Abstract: A fluid filter assembly includes a housing having a closed end and an open end; a filter element operably oriented in the housing; a baffle plate mounted to operably cover the housing open end; the baffle plate including a first axial face and an outer circumferential wall circumbscribing the first axial face; the outer circumferential wall being groove-free; the first axial face defining at least a first sealing groove; and a sealing gasket oriented in the first sealing groove; the sealing gasket forming a seal between the housing and the baffle plate. Methods of constructing, installing, and servicing includes fluids filters of the type described.

Abstract: A bowl-cartridge filter includes a filter cartridge and a bowl. The filter cartridge includes an interlock arrangement that is oriented to engage the filter bowl, when the filter cartridge is mounted in the filter bowl, and the bowl is rotated in a direction to remove the bowl-cartridge filter from a filter head. The filter bowl includes a cooperating interlock arrangement that engages the interlock arrangement on the filter cartridge. Example embodiments include cog arrangements, which include a plurality of projecting teeth. Various shapes for the teeth are possible, including house-shaped, truncated A-shaped, and pie wedged shape.

Abstract: A cartridge for treating water, the cartridge capable of releasably engaging a water treatment device. The cartridge includes a housing, an inlet for introducing untreated water into the cartridge, an outlet port for egress of treated water from the cartridge, and a treatment media for treating untreated water. The treatment media is in fluid communication with the inlet and the outlet port. The cartridge further includes a first tube having an inside surface, an outside surface, a proximal end, and a distal end, where the inside surface and/or the outside surface is a sealing surface. The cartridge further includes a second tube having an inside surface, an outside surface, a proximal end, and a distal end, where the inside surface and/or the outside surface is a sealing surface. The first tube extends from the housing and surrounds the outlet port. At least a portion of the first tube or the second tube surrounds the other such that a gap is formed between the first tube and the second tube.

Abstract: A filter device having two flow paths. The first flow path having at least one cap and fluid port. The second flow path surrounding the first fluid flow path and having at least one cap that overlaps the cap of the first fluid flow path. The second flow path also having at least one fluid port. The filter device providing a simple arrangement that is easily disinfected or sterilized.

Abstract: The present invention relates to the latch-assisted lid extractor. The present invention includes a canister and a lid connected to the canister via a latch assembly. The latch assembly includes an over-center lock to removably secure the lid to the canister. Additionally, the latch assembly can be moved from a first position sealing the canister with the lid to a second position urging the lid away from the canister. The present invention provides a mechanism that can both securely latch or fasten a lid to a canister and at the same time assist in removing the lid from the canister to enhance ease of operation.

Abstract: A filtration apparatus for use in polymer processing includes a housing having an internal bore for directing polymer flow and a channel oriented transversely to the bore. A slide plate for supporting filters is movable through the channel and across the bore. An annular upstream seal ring sealably contacts the slide plate. A surface of the upstream seal ring facing the upstream direction is angled with respect to the bore. A plurality of ring segments are arranged to form an annular segmented ring. The segmented ring presents a tapered ring surface that is generally complimentarily angled relative to the angled surface of the upstream seal ring. Pressurized polymer flowing through the bore imparts radially forces on the ring segments, causing the ring segments to impart axial forces on the upstream seal ring to enhance the seal interface between the upstream seal ring and the slide plate.

Abstract: Methods of making a filter element may comprise inserting end portions of a filter and a core into a liquid bonding material of an end cap. The end portions may be inserted into the liquid bonding material at the same time or at different times. Inserting the end portion of the core into the liquid bonding material may include separating some of the liquid bonding material from the end portion of the filter. The end portion of the filter is bonded to the end cap, while the core may or may not be bonded to the end cap. The inner periphery of the end portion of the filter near the bond may be supported by an outer wall of the core.

Abstract: A fluid filter assembly including a canister having a first passage and a second passage. A filter element is disposed within the canister and defines a bore, which is aligned with and in communication with the first passage. An end-cap is mounted on the end of the filter element and has a center portion, which is aligned with the bore of the filter element and has at least one bypass hole. A washer valve is mounted on the center portion of the end-cap, and has a closed position, wherein the washer valve sits flush against the end-cap sealing the at least one bypass hole from the bore, and an open position, wherein the washer valve deflects away from the end-cap exposing the at least one bypass hole to the bore.

Abstract: A filter element and assembly for fluid applications which require a purging of air, and particularly for applications where the filter element is horizontally oriented (side loaded), where the filter element is rotationally positioned relative to the housing such that a vent orifice is properly located for venting air from the filter element as the element fills with fluid. The housing includes a cylindrical body with a closed end a threaded open end, and a threaded, cup-shaped cover which is screwed down onto the housing. The filter element and housing include i) cooperating retaining devices which temporarily couple the filter element to the housing cover when the element is initially inserted into the housing and the cover is initially screwed onto the housing; and ii) cooperating orientation devices which rotationally orient the filter element in the housing as the housing cover is further and fully screwed down onto the housing.

Abstract: The filter comprises an outer casing (11), an upper closure cover (12), and a filter cartridge (20) having a tubular filter medium (21) positioned inside the inner chamber (13), to separate the filter inner chamber (13) into a first region communicating with the inlet and a second region communicating with the outlet, and an upper disc (22) joined to the upper end of the filter medium (21). First coupling elements (31) joined to the cover (12) and projecting axially towards the interior of the chamber (13), and second coupling elements (41) joined to the upper disc (22) and projecting axially towards the upper cover (12), are provided to act together to achieve mutual snap-coupling.

Abstract: A filter housing for retaining a roomside replaceable filter is generally provided. In one embodiment, the filter housing includes one or more sidewalls defining an interior volume. Each sidewall includes a first section and an adjacent second section sealingly coupled thereto. A sealing member is coupled to the second section and extends into the interior volume. The sealing member is adapted to provide a gas-tight seal between with a replaceable filter and the filter housing. A hole is disposed through at least one of the first or second sections. The first section is sealed to the second section around a perimeter of the hole.

Abstract: A refrigerant filter, attachable to automotive air-conditioning systems, for removal of debris from air-conditioning refrigerants. The filter media is contained within a two-part hollow body for flow-through filtration of the refrigerants. The first and second parts of the hollow body are sealingly and removably attachable to one another to easily gain access to the filter media, which permits replacement of the filter media without removal of the filter body from the refrigerant line. The apparatus includes a first and second filter media, in which the second filter media prevent transfer of portions of the first filter media into the air-conditioning system.

Abstract: The present invention is directed to a filter cartridge having a filter media chamber and a substantially hollow neck defining a distal end portion, an elongated portion and a proximal end portion for mating with the filter media chamber and connecting with a filter head having an inlet and outlet conduit. A tubular member is disposed axially in the neck which defines an inner axial passage and a radially outer axial passage bounded by the periphery of the tubular member and inner surface of the neck, so that the inner axial passage and the outer axial passage provide independent conduits for fluid flow through the neck. The tubular member has an opening in the distal end portion of the neck and the outer axial passage has an opening in the elongated portion of the neck. In addition, a bypass opening to the outer axial passage is located in the distal end portion of the neck.

Abstract: Ceramic filter elements (1, 15, 26) have a feed surface covered with a ceramic filter membrane (4, 19). As a feed liquid flows over the feed surface, a portion of the liquid passes through the membrane and the filter and is discharged through a discharge surface as a permeate liquid flow. Between the feed and discharge surfaces, the filter element includes an impermeable surface portion (8, 24, 30) which contacts a seal or gasket assembly (17, 29). The seal or gasket assembly includes two seal portions (9, 10) which define a channel (12, 22, 31) in between. The channel connects with a discharge channel (11, 23, 32). In this manner, any liquid leaking between the filter element and another filter element or a housing (21, 27) enters the discharge channel (11, 23, 32). Liquid in the discharge channel indicates a leak in the seal and potential contamination of the permeate liquid.

Abstract: A filter element assembly includes an outer filter member and an inner filter member. The filter assembly is also provided with a support cap having an outer ring, which is connected to the outer filter member, and an inner ring, which is connected to the inner filter member. The support cap also includes a plurality of connecting members connecting the outer ring to the inner ring, which is positioned substantially within the outer ring. Each of the connecting members is sized and shaped so as to allow the outer ring and the inner ring to move relative to each other.

Abstract: A filter cartridge for use with a base to create a filter assembly. The filter cartridge includes a seal to establish a fluid flow within the filter assembly and a resilient bias member to bias the filter cartridge away from the base. The resilient bias member in cooperation with a fastening mechanism secures the filter cartridge to the base.

Abstract: A fluid filtration system includes a filter receiver located in a fluid reservoir housing and a replaceable filter module adapted to mount in the filter receiver. Fluid to be filtered is exposed to a filter media included in the filter module and mounted in a filter chamber provided in the filter receiver. The filtered fluid is discharged into a fluid reservoir located in the fluid reservoir housing and outside the filter receiver. Low-pressure fluid is then pumped from the fluid reservoir to a fluid user and fluid discharged from the filter user is conducted to the filter chamber for filtration in the filter media.

Abstract: A bowl-cartridge filter includes a filter cartridge and a bowl. The filter cartridge includes an interlock arrangement that is oriented to engage the filter bowl, when the filter cartridge is mounted in the filter bowl, and the bowl is rotated in a direction to remove the bowl-cartridge filter from a filter head. The filter bowl includes a cooperating interlock arrangement that engages the interlock arrangement on the filter cartridge. Example embodiments include cog arrangements, which include a plurality of projecting teeth. Various shapes for the teeth are possible, including house-shaped, truncated A-shaped, and pie wedged shape.

Abstract: The invention relates to a device for using various types of coupling system to connect together a tube (2) and a filter housing (3).

Abstract: A sealing ring is anchored to a filter retainer included in a fluid filter assembly. An insert-molding process is used to anchor the sealing ring to the filter retainer.

Abstract: The invention relates to a filter device with a filter housing (10) and a first filter element (12), arranged therein through which a medium may flow in a given direction and with a bypass device (22). Along with the first filter element (12), a further second filter element (32) is provided, said filter elements (32) are arranged in series, one behind the other, in the direction of flow and, on the bypass device (22) being activated, the further filter element (32), immediately following in the direction of flow, carries out a filtration of the medium. The further filter element thus takes over the main filtration of the medium on actuation and operation of the bypass device as the first filter element is essentially no longer available for a filtration process due to the bypass device.

Abstract: A separator for liquid, in particular for removing oil from crankcase gases, having a cover (11) into which a mount (13) for a cylindrical separating cartridge (14) is incorporated. The separating cartridge is composed, for example, of a non-woven separating material (20) wound around a support body (22) having end plates (33) on the end faces (32) of the support body. The end plates (33) may be composed, for example, of a two-component synthetic resin material. This results in a stable component which can be sealed utilizing the elasticity of the end plate (33) when pushed into the mount (13). This results in a cost effective exchangeable part in which several seals are saved in the complete structural component and yields a structural unit having increased economic effectiveness.

Abstract: A filter head and a spin-on fuel filter element where the filter head includes an inlet and an outlet. A threaded nipple extends downwardly from a base of the filter head and includes a central flow passage. A valve member located in the flow passage is normally biased closed. The valve member includes a threaded portion extending outwardly from the nipple. The filter element includes upper and lower end caps, and is located in a housing having a tap plate. The tap plate includes a threaded central opening for screwing the filter element onto the filter head. The upper end cap supports a threaded sleeve which is screwed onto the valve member. The sleeve/valve member combination has a different thread pitch than the tap plate/nipple combination, which moves the valve member to an open position when the filter element is installed on the filter head.

Abstract: A one-piece filter cartridge is formed by inserting an open ended cylindrical screen and an end screen for the cylindrical screen in a mold and overmolding with engineered resinous material to form spaced annular and axial support ribs for the screen material. The cartridge is suitable for use in an hydraulic circuit for filtering bi-directional and radial flow without backwashing trapped particles from flow in one axial direction. One of the ribs has an annular groove for a seal ring for sealing about the cartridge upon insertion in a flow passage.

Abstract: This invention relates to a liquid filter which includes a housing and a rotatable lid for covering the opening in the filter housing. The housing incorporates the inlet port and the outlet port for the filter. The lid is secured to the housing by rotating movement in which cam followers carried by the lid engage cam members carried by the housing to cause the lid to be cammed downwardly upon the housing. As the lid is drawn down onto the housing, an annular seal carried by the lid engages the inner surface of the housing to form a seal between the lid and the housing, covering a side opening in the housing.

Abstract: A filter for filtering liquids, especially fuel, which includes a concentric housing, an unfiltered liquid inlet, and filtered fluid outlet, and a backflow member. A concentric filter element, with a dirt collecting chamber in the lowermost part thereof, is disposed in the housing, which is closed with a cover. The housing also contains a riser pipe having a return bore hole in the uppermost part thereof, as well as a return pipe. An intermediate pipe, which is sealingly closed by the cover, is disposed above the riser pipe, and the filter element is removably attached to the intermediate pipe.

Abstract: The filter device contains a stack of filter rings (2), preferably consisting of plastic. Each filter ring (2) contains a number of cams (3) which are distributed evenly over the face, and diametrically opposed recesses. When the cams (3) and the recesses of adjacent filter rings (2) lie flush on top each other, a gap (7) is formed between them. The gap openings of the filter element (8), which consists of several filter rings (2) layered on top of each other, can be cleaned efficiently by means of a back-flow device comprising nozzle bodies (70). The characteristics of the filter can be altered by selecting a filter gap with different filter rings and different filter stack heights.

Abstract: A filter element is provided with an ascending pipe and a filter material subject to soiling and is supported by a supporting pipe. The filter material is separable from the ascending pipe such that the multi-component ascending pipe can be reused and to reduce the weight of hazardous waste to be disposed of when the soiled filter material has been changed. The ascending pipe is provided at least on one of its ends with a reception for the filter material in such a manner that the filter material with the supporting pipe as one assembly (22) and with the ascending pipe (10) as another component are detachable coupled, allowing the exchange of the soiled filter material by new filter material while keeping the ascending pipe. The filter element can be assembled during production with less effort, thereby allowing for a reduction of costs.

Abstract: The invention relates to a filter device (10) for filtering a liquid, in particular a hydraulic oil, having a substantially cylindrical filter housing (12), which accommodates a filter element (30) and can be closed off by means of a cover (18), the filter element (30) having an associated untreated region (70) with an inlet (22) for supplying liquid which is to be filtered and a clean region (74) with an outlet (26) for removing filtered liquid, and the filter element (30) comprising an end plate (58) which is remote from the cover (18) and on which there is mounted a radially acting sealing element (62) for sealing the untreated region (70) of the filter element (30).

Abstract: A conically shaped filtration and/or separation apparatus is provided which is constructed from a stack of filters at least some of which are different sizes superposed above each, other, of said plurality of said filters in a fluid communicable relationship. A collapsible version of such conically shaped filter and/or separation apparatus is provided whereby a plurality of such filters are connected together using two piece interlocking or connecting end caps.

Abstract: Each cap of a pair of end caps mounted on opposed ends of a conventional radial flow cylindrical filter element of a filter cartridge includes a circular sleeve extending axially from the filter element for penetrably receiving a supporting stud and for maintaining an O-ring seal therebetween. The area of one of the end caps radially outwardly of its circular sleeve is greater than the corresponding area of the other end cap to cause fluid to be filtered to pressure bias the filter cartridge toward the other end cap and to positionally retain the filter cartridge within its housing. A positioning member extending into the filter element from one of the end caps receives and stabilizes sleeve for a u/v lamp disposed within the filter element to kill any microorganisms present and to oxidize any organic matter subjected to the emitted ultra-violent radiation.

Abstract: A filter assembly includes a bowl assembly and a head member enclosing a filter cartridge. A filter center tube is permanently fixed to the bowl but allowed to rotate within a pocket in the bottom of the bowl. The top of the center tube is threaded for fastening to a stud on the filter mounting head. The center tube cannot be threaded onto the stud without the filter assembled over the center tube and into the bowl. In order to assemble the bowl to the head, the operator must turn the outside of the bowl. If a filter is not present, the bowl will turn independently of the center tube and no torque is transmitted to the threads. When the filter is properly installed, a series of tabs or features spaced around the inner perimeter of the wall of the bowl interlock with corresponding grooves or features in the outside diameter of the end cap of the filter. Tabs or features on the outer diameter of the center tube also interlock with grooves or features in the inside diameter of the end cap.

Abstract: A filter assembly including a filter housing defining an interior chamber with an open end, a filter disposed within the interior chamber, and a cover removably positioned over the open end to enclose the interior chamber. The filter housing defines an axially-facing sealing surface spaced from the open end. The filter includes a filter element and a flange element, with the flange element having a hook-shaped lip portion defining an axially-facing groove adapted to securely retain an O-ring seal therein. The cover includes an axially-extending sidewall portion and a laterally-extending flange portion, with the sidewall portion defining an outward taper adapted to retain an O-ring seal thereon. A clamp is used to bias the cover into sealing engagement with the open end of the filter housing. The cover in turn biases the flange element of the filter into sealing engagement with the axially-facing sealing surface of the filter housing.

Abstract: A filter cartridge comprising an annularly closed filter medium provided with end disks (16). Within the interior of the cartridge there is a support tube (24), which is made in one piece and has a radial sealing ring (25) in its interior. The outside diameter of the support tube is chosen such that the support tube can be inserted into the filter cartridge. This produces a sealing effect between the end disks (16) and the outer circumference of the support tube. The filter cartridge of the invention has the advantage of being cost-effective to produce and simple to assemble.

Abstract: A filter system in which a housing and an environmentally friendly filter cartridge are coordinated to provide ease of change of the filter cartridge and reliable operation. The cartridge contains no metal parts and is readily incinerateable. The housing is provided with a number of “universality” features including a changeable bottom which allows the housing to operate as a fuel filter, a lubrication filter, or a hydraulic filter in different applications. The housing and cartridge are configured to provide support for the plastic elements of the cartridge to prevent crushing of the filter under normal and abnormal filter operating conditions. A key system associated with the cartridge and the housing provides assurance that the correct filter is installed for a particular application.

Abstract: An environmentally friendly dual lube venturi filter cartridge which has no metallic components. A plastic centertube having a venturi section supports a bypass filter element on standoffs molded into the centertube. An outer concentric full flow filter element surrounds the bypass filter. The full flow filter is supported on a plastic centertube which creates a gap between it and the bypass filter. A first bypass filter endcap both seals the bypass filter and provides standoffs for allowing full flow oil around the bypass filter. The standoffs thus split the full flow which progresses through the primary filter in two paths, a primary path around the bypass filter and into the centertube, and a bypass path through the secondary filter and the venturi. Plastic upper and lower endcaps carry grooves for simple sealing gaskets, a radial seal gasket on the bottom which seals against both the endcap which carries it and a flange in the housing, and an axial seal gasket at the top.

Abstract: An environmentally friendly acid neutralizing filter cartridge is adapted to be mounted in a cartridge mounting body of an engine oil circuit for filtering particulates and neutralizing acid in oil. The filter cartridge comprises a support housing that comprises substantially no metal parts such that the filter cartridge can be readily incinerated. A full flow particulate filter and a bypass particulate filter are arranged in the support housing. A bed of acid neutralizing particles is contained in the support housing. The housing is configured such that a predetermined primary flow path is defined through the filter cartridge that passes through the full flow particulate filter and bypassing the bed of acid neutralizing particles; and a predetermined bypass path is defined through the filter cartridge that passes, in sequence, through the bed of acid neutralizing particles and the bypass particulate filter.

Abstract: The present invention relates to the latch-assisted lid extractor. The present invention includes a canister and a lid connected to the canister via a latch assembly. The latch assembly includes an over-center lock to removably secure the lid to the canister. Additionally, the latch assembly can be moved from a first position sealing the canister with the lid to a second position urging the lid away from the canister. The present invention provides a mechanism that can both securely latch or fasten a lid to a canister and at the same time assist in removing the lid from the canister to enhance ease of operation.

Abstract: An improved seal and method of making is disclosed for sealing a filter element to a filter mounting. The improved seal comprises a bonding pad formed from a sintered matrix of randomly oriented metallic fiber. The bonding pad is disposed between the filter element and the filter mounting A mechanical fastener coacts between the filter element and the filter mounting for compressing the bonding pad to provide a seal between the filter element and the filter mounting. The bonding pad may be heated to create a frangible seal.

Abstract: A fluid filter includes a filter housing and a filter module. The filter module includes a filter medium and a fusible seal. The fusible seal is bonded to a portion of the filter medium and cooperates with the housing to prevent fluid from bypassing the filter medium.

Abstract: A suction oil filter for transmissions or engines with a top shell, a bottom shell, with an oil intake opening and an oil outlet, said suction oil filter being positioned in an oil pan or in the transmission housing, characterized in that the oil intake opening has arranged therein a movable intake tube which is pressed by resilient means mounted on the inside of the intake tube outwards onto the oil pan base or the transmission housing and an oil intake opening is thus created at a defined constant distance from the oil pan base or transmission housing.

Abstract: A filter cartridge for liquid media at risk for freezing employed in fuel cell operated vehicles and internal combustion engines has a housing and a filter lid connected to the housing for closing the housing. A filter insert is inserted into the housing and provided with at least one filter element and terminal parts. The filter element is positioned between the terminal parts. The filter insert also has at least one pretensioning part for axially pretensioning the at least one filter element. At least one reinforcement part is provided that has at least one profiled section. It is inserted into the filter element and receives at least one of torque and axial forces. This prevents twisting of the filter element and improves the sealing action and the filter function.

Abstract: A sealing ring is anchored to a filter retainer included in a fluid filter assembly. An insert-molding process is used to anchor the sealing ring to the filter retainer.

Abstract: A filtration cartridge faucet assembly contains a filtration cartridge having a filter core that is concealed beneath a sink deck through the use of an escutcheon mount. The escutcheon mount permits access to a renewable filtration cartridge from above the sink deck while concealing and protecting the filtration body. The renewable filtration cartridge is equipped with a flow control device, as well as counter rotation devices that prevent undesirable outrotation of a threaded cap.

Abstract: A fluid filter assembly includes a housing having a closed end and an open end; a filter element operably oriented in the housing; a baffle plate mounted to operably cover the housing open end; the baffle plate including a first axial face and an outer circumferential wall circumbscribing the first axial face; the outer circumferential wall being groove-free; the first axial face defining at least a first sealing groove; and a sealing gasket oriented in the first sealing groove; the sealing gasket forming a seal between the housing and the baffle plate. Methods of constructing, installing, and servicing includes fluids filters of the type described.

Abstract: A filter (10), including an inside-out reverse flow air filter, has an annular filter element (20) with an upper end cap (24) provided by a resiliently compressible trifunctional member having: (a) a wall (50) deflecting debris radially outwardly within the housing away from the central opening (26) of the hollow filter interior (22); (b) an air entrance guide throat (52) directing air to the central opening (26) with reduced restriction; and (c) a sealing surface (54) sealed to the housing and blocking air flow from the inlet (28) to the outlet (34) otherwise bypassing the filter element. In further embodiments, simplified and cost reduced sealing is provided by a configured end cap.