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Claim 1

IN A FILTER APPARATUS COMPRISING A MAIN BODY HAVING INLET AND OUTLET PORTS AND A PARTITION MEANS TO ISOLATE SAID PORTS ONE FROM THE OTHER, AN OUTLET CHAMBER CONNECTING SAID INLET AND OUTLET PORTS AND A FILTER-CONTAINING SUMP CONNECTED TO SAID MAIN BODY, A FAIL-SAFE BYPASS CONNECTION BETWEEN THE INLET AND OUTLET PORTS COMPRISING A PRESSURE INDICATOR PISTON CHAMBER HAVING AN INLET PRESSURE PORTION AND AN OUTLET PRESSURE PORTION, A FIRST PASSAGEWAY CONNECTING SAID INLET PORT WITH AN INLET TO SAID INLET PRESSURE PORTION, A VALVE PORT IN SAID PISTON CHAMBER CONNECTING SAID OUTLET PORT WITH SAID PISTON CHAMBER AND SPACED FROM SAID INLET TO SAID INLET PRESSURE PORTION, A FIRST PISTON SEPARATING SAID INLET AND OUTLET PRESSURE PORTIONS OF THE PISTON CHAMBER, AND AN INDICATOR PISTON MOUNTED WITHIN SAID INLET PRESSURE PORTION OF SAID CHAMBER FOR MOVEMENT IN RESPONSE TO PRESSURE CHANGES AT SAID INLET PORT AND HAVING MEANS OPERATIVELY ASSOCIATED WITH SAID FIRST PISTON FOR RESTRAINING SAID INDICATOR PISTON IN A FIRST POSITION DURING NORMAL OPERATION OF SAID FILTER, MEANS SUPPORTING SAID FIRST PISTON FOR TRAVEL BETWEEN SAID INLET TO SAID INLET PRESSURE PORTION AND SAID VALVE PORT OF SAID OUTLET PRESSURE PORTION, AND MEANS INCLUDING BIASING MEANS FOR NORMALLY POSITIONING SAID FIRST PISTON WITHIN SAID PISTON CHAMBER TO ISOLATE SAID INLET TO SAID INLET PRESSURE PORTION FROM SAID VALVE PORT AND TO RESTRAIN SAID MOVEMENT OF SAID INDICATOR PISTON DURING NORMAL OPERA-