Cardone Select 55-21110 New Water Pump Every unit is supplied with a premium quality mounting gasket for a guaranteed, leak-proof seal on all mounting surfaces 100% computer tested for maximum performance and durability O.E.M. supplied NEW unitized seals ensure long-lasting, trouble-free performance Original casting specifications are strictly followed to ensure proper fit for easy installation and proper water flow for maximum cooling Bearings made of heat-treated carbon or carburized steel are sealed and lubricated to ensure smooth performance throughout unit life A cooling system maintenance check should be performed at least once every two years. Consult vehicles service manual for specific guidelines on cooling system. A hydrometer can be used to measure specific gravity of coolant. A refractometer can be used to determine coolant concentration and freeze point. For most modern vehicles, knowing the engine size is sufficient to locate the correct replacement water pump. However, with some older passenger vehicles and medium duty applications, you may need an identification number that is either stamped on the original casting or attached on a metal tag. You may also need a specific dimension off of the original pump to correctly identify the replacement pump. Always refer to the catalog for details on how to correctly identify the water pump for your application.