Replacement water pumps designed specifically for GM based MerCruiser V8s with V-belt and 2 piece pumps. The water pump is the heart of your inboard or I/O cooling system; engine performance and efficiency can suffer if the the pump is not operating properly. Each Sierra pump is engineered to meet or exceed factory specifications and is matched to the GM block used for many MerCruiser engines. These marine water pumps feature a plastic housing with an aluminum shaft to stand up to the marine environment. Pumps include mounting bolts and washers. Sierra water pumps are made from new components and are not remanufactured. Key Features Engineered to be an exact match to OEM pumps Pumps are assembled using new castings Compatible with any MerCruiser V8 applications with V-belt and two piece pump Backed by SeaStar Solutions Limited Two-Year Warranty Sierra Part Number 18-3600 Application TableApplicationOEM Part NumberMerCruiser Sterndrive46-59112A2, 46-63450A2, 46-73823A7, 46-72774A11, 46-72774A32The Sierra Engine Parts SelectorIn addition to water pumps, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see ourEngine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.