1Fitment: Water pump impeller repair kit is suitable for 9.9hp 2 4 stroke 2 cylinders 1996?2019, for 15hp 2 4 stroke 2 cylinders 1996?2019 2OE Number: Part numbers for reference are 18?3433, 63V W0078 00, 63V W0078 01 00, 63V 44301 00, for Mallory 9?48609, 9?48617, for Sierra 18?3410, 18?3412. 3Function: This kit is used to repair water pump impeller, to push the coolant through the engine block, radiator and hose of the car to take away the engine heat from the system. 4Suggestions: It is recommended to check the water pump impeller every quarter and replace it every two to three quarters to ensure that the engine runs smoothly. 5High Strength Material: The water pump impeller rebuild kit is made from metal, Abs and rubber compound to make sure durability and reliability.