This is the water pump kit for Evinrude for Johnson 40/45/48/50 HP Part Numbers: 438592 433548 433549 777805 Durable: The water pump impeller is durable, not easy to break or deform, and can be used for a long time. Installation: Only simple hand tools are needed for installation. Direct replacement, OE grade quality and durability. Please Check your water pump impeller every season, and replace it every two to three seasons, in order to ensure that engine to run smoothly