Yamaha - Water Inlet Cover 1 Cooling System Component 6CB-45214-20-00. Overview. This is one of those parts that quietly does its job until it doesn't-and then you've got cooling issues on your hands. The water inlet cover helps manage how water enters the lower unit, keeping flow clean and consistent. I've seen engines run hot just from a damaged or clogged inlet area, so it's not something to overlook. If you're already servicing the lower unit, it's a smart piece to inspect or replace while you're in there.. Key Features. • Controlled Water Intake - Helps regulate water entering the cooling system for consistent flow.. • Debris Protection Design - Shields the intake area from buildup that can restrict cooling.. • OEM Fit Accuracy - Matches Yamaha factory specs for proper sealing and alignment.. • Durable Marine Construction - Built to handle constant water exposure and harsh conditions.. Engine & Boat Compatibility. Verify compatibility with your specific Yamaha outboard model and p