The Udor Kappa 40 / Honda Assembly is the combination of a Udor Kappa 40 duplex diaphragm pump and a 5.5 HP, GX160QA Honda gas engine. This assembly also includes a Udor 5027.75 gearbox and a 6010.24 regulator pressure relief valve. When this product is shipped, oil is placed in the Udor pump but not in the gearbox or Honda engine. Bolt down the Honda engine, attach your hoses and begin spraying.