Gasket seals both sides of Mercruiser center rise exhaust manifold/riser block off plate.

Mercruiser Riser Block Off Plate Gasket | Barr Marine MC47-27-41811

• Barr Mercruiser block off plate gasket
• For Mercruiser center rise exhaust manifolds in fresh water cooled applications
• For use with 20-87918 stainless steel block off plate
• Sold individually – 2 required for each side of block off plate
• Replaces Mercruiser 27-8637251, 27-863725, 27-860231, 27-41811, 87918, 87918A1
• Replaces Marine Power 0501-001H4