Exhaust Flapper With Clamp 4 in. | Sierra 18-4457

Sierra 4 in. Exhaust Flapper With Clamp | 18-4457

Exhaust protector valve mounts on the outside of 4 in. exhaust tip to prevent backflow of water into the exhaust.

• For 4 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 12644A1, 12644Q01
• Replaces OMC/Johnson/Evinrude 509495
• Replaces Mallory 9-44001