Yamaha Water Pump Housing Set 99999-03936-00. Overview. The Yamaha Water Pump Housing Set 99999-03936-00 is a genuine original equipment manufacturer component designed to protect and support the internal elements of your engine's water pump system. This housing set plays a crucial role in maintaining proper water flow, helping regulate engine temperature and prevent overheating during operation.. A well-functioning water pump housing ensures that cooling components remain properly aligned and s