A filter incorporating a vessel defining an interior space, the vessel having a ceiling and a floor; filter media contained within the interior space; a helically threaded port which opens the vessel's interior space at the ceiling; a turn plate having a an outer edge; a retainer ring and snap ridges combination which interconnects the turn plate and the vessel, positions the plate beneath the floor, and facilitates circumferential motion of the plate's outer edge; a turn handle connected operatively to the plate, the turn handle being adapted for impelling the turn plate's circumferential motion; and ratcheting hook and ridge combinations which further interconnect the turn plate and the vessel, the hooks and ridges being adapted for, upon turning of the handle, translating a limited screw tightening torque to the ceiling's helically threaded port.