The General Pump 90367100 replaces a worn or leaky O-ring inside plunger pumps. Its dimensions measure 11x2 mm. Each pump requires 3 of these O-rings to fully service it. It fits AB, HF, HFN, HS, KE, KEZ, KF, KFZ, and KS series pumps. An official OEM part to ensure a proper fit when used with a compatible pump.