Yamaha - Water Pump Gasket Cooling System Seal 6CJ-44315-00-00. Overview. Anytime you're servicing a Yamaha water pump, the gasket is one of those parts you don't take chances on. It's what keeps the system sealed so water flows where it should without losing pressure. I've seen cooling issues come from a bad gasket more times than people expect. When it's installed right, the pump does its job and the engine stays cool even on long runs.. Key Features. • Sealed Cooling System Fit - Creates a tight seal to maintain proper water pressure and flow.• Precision Cut Design - Matches Yamaha specifications for accurate fit and alignment.• Leak Prevention Support - Helps prevent water loss that can lead to overheating.• Durable Gasket Material - Built to handle heat, pressure, and constant exposure to water.• Reliable Pump Efficiency - Supports consistent operation of the water pump assembly.. Engine & Boat Compatibility. Designed for Yamaha outboard engines utilizing a water pump gasket withi