SEI MARINE PRODUCTS- Yamaha Water Pump Kit 63V-4431-00-00 9.9 15HP 2 Stroke 1996-Current With Housing This water pump kit replaces OE#: 63V-4431-00-00 and it fits 9.9 and 15 HP 2 stroke Yamaha outboard lower units from 1996-current. It includes the housing.