Yamaha - Water Pump Gasket Cooling System 6E0-44315-A0-00. Overview. When you're servicing a Yamaha water pump, the gasket is one of those parts you never want to reuse. It might look fine at a glance, but once it's compressed and heat-cycled, it won't seal the same again. I've seen small leaks turn into cooling issues just from skipping this step. Putting in a fresh gasket helps keep everything sealed tight so the pump can do its job without losing pressure.. Key Features. Reliable Sealing Surface - Creates a tight seal between water pump components to prevent leaks.. Heat-Resistant Material - Built to handle constant temperature changes inside the lower unit.. Maintains Cooling Efficiency - Helps preserve proper water pressure and flow through the system.. Exact Fit Design - Matches original specifications for proper alignment and easy installation.. Engine & Boat Compatibility. Designed for Yamaha 2-stroke outboard engines using standard water pump assemblies. Commonly used on small