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Claim 1

A FILTER COMPRISING A HOUSING, A CHAMBER WITHIN SAID HOUSING, AN INLET PASSAGE COMMUNICATING WITH SAID CHAMBER, AN OUTLET PASSAGE IN SAID HOUSING, A FILTER CARTRIDGE POSITIONED IN SAID CHAMBER BETWEEN SAID INLET AND SAID OUTLET, SAID FILTER CARTRIDGE HAVING A HOLLOW CORE, SAID OUTLET COMMUNICATING WITH SAID CORE, SAID INLET COMMUNICATING WITH THE AREA WITHIN SAID CHAMBER ABOUT SAID CARTRIDGE, A CAP FOR SAID HOUSING, A PLURALITY OF CIRCUMFERENTIALLY SPACED LEGS EXTENDING INWARDLY FROM SAID CAP, A SLEEVE CARRIED BY SAID LEGS, SAID SLEEVE EXTENDING INTO THE OPPOSITE END OF SAID FILTER ELEMENT CORE, A VALVE SEATED WITHIN SAID SLEEVE HAVING ONE SIDE THEREOF IN COMMUNICATION WITH SAID INLET AND THE OTHER SIDE IN COMMUNICATION WITH SAID CORE WHEREBY THE PRESSURE DIFFERENTIAL ACROSS THE CARTRIDGE URGES SAID VALVE OUT OF SEALIDNG ENGAGEMENT WITH SAID SLEEVE, A ROD CARRIED BY SAID VALVE AND EXTENDING OUTWARDLY THROUGH SAID CAP, A SPRING CARRIED BY AND EXTERNALLY OF SAID CAP, THE OUTER END OF SAID ROD BEING CONNECTED WITH SAID SPRING THEREBY URGING SAID VALVE TOWARD SEALING ENGAGEMENT WITH SAID SLEEVE, AN INDICATOR ASSEMBLY CARRIED BY SAID CAP AND HAVING AN ACTUATING ENGAGEMENT WITH SAID ROD WHEREBY MOVEMENT OF SAID VALVE OFF SAID SEAT IS EFFECTIVE TO ACTUATE SAID INDICATOR ASSEMBLY, SAID SPRING URGING ELEMENTS OF SAID ASSEMBLY TOWARD NONINDICATING POSITION, SAID INDICATOR ASSEMBLY INCLUDING ELEMENTS MOVABLE TOWARD SAID CLOSURE IN RESPONSE TO MOVEMENT OF SAID VALVE OFF SAID SEAT.