6.5 HP Cold Water Pressure Washer Pump Fit for 3/4″Horizontal Crank Shaft Engine by | Jul 21, 20261 x Pressure Washer Pump. Type: Cold Water Pressure Washer. Engine Type: Horizontal. Inlet Connector: 1/2”plug. Pump Horsepower: 6.5-7 HP. Engine Horsepower: 5.5-7 HP. Starting System: Recoil Pull Start.