Water pump and high performance consists of diesel engine and pump kit.The pump is fixed on a frame with shock absorbes. The self priming pump consists of pump body ,pump cover, flow guidance , impeller amnd seals, etc. Shaft sealing is machinery type sealing and the inlet of impeller so that is can self prime and you only need to fill water into the body of the pump. The inlet of pump is fixed with a one-way valve to prevent liquid from being drained into water pool from the pump body by siphon after stopping the machine. It must garantee store enough liquid in the pump body for next start.