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Claim 1

A FILTER COMPRISING (A) A REPLACEABLE CATRIDGE OF THE TYPE HAVING A CYLINDRICAL, FORAMINOUS CORE AND FILTERING MEANS EXTENDING TRADIALY OUTWARDLY FROM AND SURROUNDING SAID CORE, SAID CARTRIDGE HAVING CONTINUOUS ANNULAR SEALING SURFACES AT BOTH OF ITS ENDS, (B) A GENEALLY CYLINDRICAL HOUSING ENCLOSING SAID CARTRIDGE, (C) AN END PLATE CLOSING ONE END OF SAID HOUSING. (D) AN OUTLET NIPPLE SEALED THROUGH SAID END PLATE AND EXTENDING INTO SAID HOUSING COAXIALLY THEREWITH, SAID NIPPLE BEING SMALLER THAN SAID CORE AND EXTENDING PARTLY INTO SAID CORE AND THE BORE OF ONE OF SAID ANNULAR SEALING SURFACES. (E) A PLUG IN SEALING ENGAGEMENT WITH THE OTHER OF SAID ANNULAR SEALING SURFACES, (F) A SPIDER FITTING WITHIN AND SPANNING THE SAID HOUSING ADJACENT ITS OPPOSITE END, (G) RETAINERS FIXED TO SAID HOUSING AND EXTENDING RADIALLY INWARDLY FROM THE CYLINDRICAL WALL THEREOF AND RELEASABLY ENGAGED BY SAID SPIDER, (H) AN ADJUSTMENT MEANS CONNECTED TO AND BETWEEN SAID SPIDER AND SAID PLUG FOR DRIVING SAID PLUG AWAY FROM SAID SPIDER THEREBY TO URGE SAID PLUG INTO SAID CORE WHEN SAID SPIDER IS POSITIONED IN ENGAGEMENT WITH SAID RETAINERS, (I) A COVER FOR CLOSING SAID OPPOSITE END OF SAID HOUSING, AND (J) MEANS FOR RETAINING SAID COVER IN PLACE UPON SAID HOUSING.