This kit includes a 5-inch and a 6-inch exhaust flapper valve, compatible with standard marine exhaust pipe outside diameters. Note: The 5-inch valve requires two 45° cuts during installation.
Made from compounded EPDM rubber with UV stabilizer, this flapper valve effectively prevents water from entering the exhaust system, offering weather and ozone resistance.
Directly replaces common OEM part numbers ：Compatible with Mallory 9-44002, Compatible with GLM 89260, Compatible with Sierra 18-4458.
Each package contains one exhaust flapper valve and one corrosion-resistant stainless steel hose clamp, as shown in the product images.
Please verify fitment using your engine model or serial number. Contact our support team if you have any questions—we're happy to help ensure the right fit.

Specifications:
Size: 5" & 6" (127mm & 152.4mm)

Material: Weather-resistant EPDM rubber with UV stabilizer

Fit: Exhaust pipes with 5" or 6" outside diameter

Includes: 1x Flapper Valve, 1x Stainless Steel Hose Clamp (6-1/16" to 7" range)

Key Features:
Prevents water from entering exhaust systems

Durable compounded rubber construction

Easy to install (professional installation recommended)

Compatibility:
Replaces OEM part numbers:
Mallory 9-44002

GLM 89260

Sierra 18-4458

Important Notes:
Verify part number compatibility before purchase

For 5" installation: requires two 45° cuts

Suitable for marine engine applications

Package Contents:
1x Exhaust Flapper Valve (18-4458)

1x Stainless Steel Hose Clamp

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