Yamaha - Cartridge Insert Cooling System Component 6R3-44322-42-00. Overview. This is one of those parts that keeps water moving where it needs to go, even though you never really see it working. I've come across cooling issues that ended up being tied back to worn or clogged inserts like this. When it's in good shape, water flows clean and the engine stays at the right temp without any surprises. It's a small piece, but it plays a big role in keeping things running right.. Key Features. • Directed Water Flow Control - Helps guide cooling water through the system efficiently.• OEM Fit and Integration - Designed to match factory components for proper seating and performance.• Corrosion-Resistant Construction - Built to handle constant exposure to water in marine environments.• Supports Cooling System Efficiency - Helps maintain stable engine temperatures during operation.. Engine & Boat Compatibility. Designed for Yamaha outboard engines utilizing internal water cooling systems. Commonl