Yamaha - Impeller, water pump - 6GR-12451-00-00Yamaha Water Pump Impeller 6GR 12451 00 00 Overview The Yamaha 6GR 12451 00 00 Water Pump Impeller is a genuine original equipment manufacturer component designed to circulate cooling water through the engine and maintain proper operating temperature. The impeller is a critical part of the water pump system, using flexible blades to draw water from the lower unit and push it through the engines cooling passages. A properly functioning impeller ensures