General Pump Triplex Pressure Washer Pump — 4000 PSI, 4.0 GPM, Belt Drive, Model# EP1313S34 | Northern Tool
Amazon.com: NorthStar Pressure Washer Pump - 4000 PSI, 3.5 GPM, Direct Drive, For Use With Gas Pressure Washers, Model Number NSZW3540 : NorthStar: Patio, Lawn & Garden