Replacement stainless steel block off plate for various Mercruiser closed cooled engines.
- For Mercruiser center rise exhaust manifolds in fresh water cooling applications
- Fits Mercruiser 98502A2, 98504A3 and 44354A3 risers
- Separates engine antifreeze from raw water
- Replaces Barr MC20-87918
- Replaces Mercury 27-8637251