834438-4 89260 5 / 6 Inch Exhaust Flapper Protector Valve

SERDAMARINE / MARINE EXHAUST PARTS

Flapper Protector Valve — 5 / 6 Inch Exhaust Water Shutter

This exhaust flapper protector valve is made from weather-resistant compounded EPDM rubber with a UV stabilizer to help prevent water from entering the exhaust system. Listed with a 5 / 6 inch size designation under MerCruiser Stern / Out Drive exhaust flapper valve categories and cross-referenced with GLM 89260, it is selected by matching the required valve size and mounting configuration.

Configuration & Specifications

Engine & Exhaust Applications

This part is categorized under MerCruiser Stern / Out Drive manifold exhaust water shutter flapper valves and is intended for exhaust outlet configurations requiring a 5 / 6 inch rubber flapper protector valve. Compare the required 5 / 6 inch size designation and exact mounting arrangement with your existing exhaust flapper assembly before replacement.

• MerCruiser Stern / Out Drive — Exhaust Water Shutter Flapper Valve Applications
  Size designation: 5 / 6 inch. Intended for exhaust systems using a compounded EPDM rubber flapper valve to prevent water entry. Fits when specified — requires matching 5 / 6 inch valve size and mounting configuration

Reference Numbers

The numbers below are provided for part identification and cross-reference only; they do not alone establish full interchangeability across all mounting configurations or indicate manufacturer identity.

Check the full reference number, including any suffix, when comparing parts. In Sierra numbering, 18-4458D denotes display packaging while 18-4458 denotes non-display packaging.

Supplied Parts

• Flapper Protector Valve

Service & Installation Notes

General service guidance only. Use the service manual for your exact engine and exhaust configuration.

1. Shut down the engine, allow all exhaust components to cool completely, and secure the vessel against accidental starting or water intrusion before servicing the exhaust outlet area.
2. Inspect the exhaust passage or outlet mounting surface for debris, corrosion, or fragments from the previous valve before installing the replacement flapper.
3. Verify that the 5 / 6 inch flapper valve sits properly in its mounting location and moves freely in the exhaust flow direction while closing cleanly against backflow.
4. During initial operation after service, check for secure retention and normal exhaust flow; shut down and inspect immediately if any abnormal restriction or leakage occurs.

The Serdamarine Approach

Exhaust parts need a configuration match. Serdamarine focuses on marine exhaust manifolds and their related service parts. Application details, connection requirements and public reference numbers are presented together to support part selection.

Questions Before Replacement