Yamaha - Water Inlet Cover Cooling System Protection 6J9-45215-00-00. Overview. The Yamaha Water Inlet Cover 6J9-45215-00-00 is one of those parts that keeps your cooling system out of trouble, especially if you run in shallow or debris-heavy water. I've seen plenty of overheats traced back to clogged intakes, and most of the time it starts right here. This cover helps keep sand, shells, and stray line from getting pulled into the pump. It's a simple piece, but it goes a long way in protecting your lower unit and keeping temps steady.. Key Features. • Debris Deflection Design - Louvers help block sand, shells, and fishing line from entering the cooling system.. • Directed Water Flow - Channels water cleanly toward the pump for consistent cooling performance.. • Impact-Resistant Material - Built to handle contact and harsh marine conditions without cracking.. • Flush Mount Fitment - Countersunk mounting points ensure a tight, vibration-free installation.. • UV-Stable Finish - Holds up a