Water Pump Rebuild Kit Pro X When rebuilding your engine, do not forget to rebuild the waterpump as well. The water pump of your engine is a very important component to cool your engine to perform the best in all circumstances. ProX Water Pump Rebuild Kits are made of high quality materials and available for a wide range of Dirt Bike and ATV applications. The rebuild kits include all necessary gaskets, O-ringsbearings and seals required to rebuild your water pump..The rebuild kits include the following components: O-ringsBearingsSeals