Keep your big-block Yamaha running cool and confident with the Yamaha Impeller - 6GR-44352-00-00. Engineered for the F425 XTO Offshore and other 6GR-series V-8 outboards, this heavy-duty rubber rotor is the muscle behind your water pump, pushing a steady stream of seawater through the block even when you're throttled up and trimming high.. Molded from UV-stable, abrasion-resistant compound, each of the precisely cut vanes flexes without cracking, then springs back to full shape for consistent pressure. The brass-sleeved hub locks onto the pump shaft with factory accuracy, so there's no wobble, no uneven wear, and no surprise over-heat alarms crowding the display.. Why upgrade at your next service:. High-flow design - deep, 12-vane profile moves more water to cool that 5.6-liter V-8 under heavy load.. OEM exactness - keyed hub and diameter match Yamaha specs; zero trimming or shim packs.. Built for offshore abuse - compound shrugs off sand and silt picked up on the flats or in the surf.