The Bullet Proof Diesel Billet Water Pump is designed for maximum durability. It features an aluminum impeller in place of the OEM plastic impeller, top of the line bearing assembly, top-grade seal and an all-billet precision machined housing. This stronger impeller resists cracking along the hub helping to prevent impeller failures, overheating engines and expensive repairs. The aluminum impeller is also stiffer and stronger and therefore less likely to flex under heavy loads, leading to less cavitation and less erosion within the front cover. The billet housing is strong and more precise than a typical water pump cast housing.