Patent ID: 7186338

Claim:
A filter housing comprising: a head having an inlet and an outlet in fluid communication with a filter cartridge; a collar surrounding said head having a plurality of lower bosses, said collar forming an annular space between an inner wall of said collar and an outer wall of said head; a sump for enclosing the filter cartridge within said filter housing, said sump having a plurality of upper bosses adapted to align with the plurality of lower bosses of said collar and wherein when the housing is in a closed position and the collar is connected to said sump the upper and lower bosses are vertically aligned; a radial sealing means for providing a liquid-tight seal between said sump and said head; a pressure relief valve for depressurizing said sump prior to removing said sump from said head comprising: a piston and compression spring located within said head, said piston having a pressure-sealing portion protruding through said head and in pressure communication with an outer chamber of said sump when said sump is attached to said collar; and a release lever pivotally mounted to a bracket extending from said collar, having a flange positioned within a gap between two sets of said vertically aligned bosses on said collar and said sump, such that when said sump is in fluid communication with said head, said flange prevents said sump from being twisted open; and a means for locking movement of the plurality of bosses of said sump with the plurality of bosses of said collar when the plurality of bosses are vertically aligned when said sump is inserted into the annular space and twisted.