Exhaust Flapper Valve & Clamp Kit – Fits Inboard/Stern Drive (Replaces Sierra 18-4458, GLM 89260, Mallory 9-44002) 15HP You might also hear ticking

You might also hear ticking or high-pitched sounds from the engine bay

Plan your layout and spacing before peeling the backing from any characters

and is less likely to mark your hull

The included gaskets are critical for creating a leak-proof seal between the manifold and the transom assembly

What are the signs of a failing exhaust bellows

Exhaust Flapper Valve & Clamp Kit – Fits Inboard/Stern Drive (Replaces Sierra 18-4458, GLM 89260, Mallory 9-44002) 15HP You might also hear tickingProduct Details This Exhaust Flapper Valve & Clamp Kit Fits 5" & 6" OD Exhaust Pipes is engineered to prevent water from entering the engine through exhaust thru hulls during low speed operation, stopping, or reversing. It is designed for a broad range of inboard and stern drive applications using either 5 inch or 6 inch outside diameter exhaust pipes. It serves as a direct replacement for Sierra 18 4458, GLM 89260, and Mallory 9 44002. Installs