Exhaust protector valve mounts on the outside of 3 in. exhaust tip to prevent backflow of water into the exhaust.

3 in. Exhaust Flapper With Clamp | Sierra 18-4456

• For 3 in. diameter exhaust thru hulls
• Prevents backflow of water into exhaust system
• Stainless steel clamp included
• Designed to mount on the outside of exhaust tips
• Replaces Mercury 34765A1, 34765A2
• Replaces OMC/Johnson/Evinrude 509494
• Replaces Mallory 9-44000