SEI MARINE PRODUCTS- Yamaha Water Pump Housing 63D-44311-00-00 40 50 60 HP 2 Stroke 4 Stroke 1995+ This water pump housing replaces OE#: 63D-44311-00-00 and it fits 40, 50, and 60 HP 2 stroke and 4 stroke outboard lower units from 1995-current.