Restore optimum performance to your MerCruiser cooling system and make the most of the season Marine engines rely on the water pump to maintain optimum operating temperatures. Any restriction to the water flow can rob the engine of performance and efficiency and possibly result in overheating the engine. Sierra makes sourcing parts to service MerCruiser or Mercury water pumps easy by packaging all the necessary parts in a single kit and eliminating the extra time to search and source individual parts. Each component in the kit is engineered to meet or exceed manufacturer specifications. Sierra water pump kits let you focus on restoring the water pump and not on sourcing parts, so that you can get back on the water sooner. Key Features Kit components are engineered to meet or exceed OEM specifications Pre-packaged kit eliminates time searching and sourcing individual parts Kit includes: pump housing and base, impeller, water tube guide, impeller plate, O-rings, and gaskets. Sierra Part Number 18-3316 Application Table ApplicationOEM Part NumberGLM12150Mallory9-48310MerCruiser Sterndrive46-32437A3, 46-96148A8, 46-37433A1Mercury Marine46-78400A2, 46-96148A5, 46-44292A4, 46-42579A4, 46-48747A3, 46-57234A3, 46-58618A4, 46-60367A1, 46-37433A1, 46-32437A1, 46-60367A4, 46-64141A11, 46-73802A3, 46-73804A3, 46-69222A3, 46-96148A8The Sierra Engine Parts SelectorIn addition to water pump kits, 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.