This is one of the BEST replacement pumps This unit is designed for daily use It is perfect for contractors. It will fit most HORIZONTAL shaft engines With a 1" diameter shaft. The pump bolts to the motor with a 4 bolt pattern Bolts up on 8 to 13 horsepower Honda Motors. This pump is capable of producing up to 4000PSI at 4 GPM It will work great on any smaller washers with a 1" shaft. The pump includes: an external bypass unloader a thermal relief valve and male quick connect. It is rebuildable from valves to the packings & unloader. Features: a brass pump manifold oversized connecting rods and an oil level sight glass.