"Fast changeover, even in the field. Pre-plumbed and pre-tested. Fits 4-bolt engine face plates. Bolts not included use existing bolts from old pump to install new pump. U.S.A. Max. PSI 3,500, Shaft Diameter in. 20mm, GPM 4 1/2, HP 11 electric, 15 gas, Fuel Type Electric, gas, Application Pressure washer pump. Brand CAT Belt drive"