Yamaha Water Inlet Cover 6CE-45225-00-00. Overview. The Yamaha 6CE-45225-00-00 Water Inlet Cover is a genuine OEM component designed to protect and support the water intake system on select Yamaha high-horsepower four-stroke outboard engines. This cover helps guide cooling water into the lower unit intake passages, allowing the water pump to circulate water through the engine for proper cooling.. A properly functioning water inlet cover is essential for maintaining efficient cooling system perfo