Simpson Cleaning 90036 Triplex Plunger Horizontal Pressure Washer Replacement Pump 9.6GA12 3200PSI @ 2.8GPM with Brass Head and Powerboost Technology Direct drive horizontal pump, forged brass head, black anodized aluminum crankcase, 3/4shaft, thermal relief valve, SAE gas engine flange, threaded M22 pump outlet connection Universal to fit most brands/models Precision polished ceramic coated pistons for improved seal life, dual oversized radial ball bearings for better wear and friction resistance, and integrated unloader with easy-start feature Pre-sealed and pre-filled with oil in the pump and oversized site glass does away with the need for a dipstick Patent Pending PowerBoost Technology to enhance cleaning performance