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Marine Exhaust Flapper Protector Valve for 5" & 6" Inboard Thru-hull Outlet | Heavy Duty Rubber Protector Valve With Clamp Replaces Sierra 18-4458 GLM 89260 Prevent Water From Surging Into Exhaust System in Saudi Arabia Marine Exhaust Flapper Protector Valve for 5" & 6" Inboard Thru-hull Outlet | Heavy Duty Rubber Protector Valve With Clamp Replaces Sierra 18-4458 GLM 89260 Prevent Water From Surging Into Exhaust System in Saudi Arabia Marine Exhaust Flapper Protector Valve for 5" & 6" Inboard Thru-hull Outlet | Heavy Duty Rubber Protector Valve With Clamp Replaces Sierra 18-4458 GLM 89260 Prevent Water From Surging Into Exhaust System in Saudi Arabia Marine Exhaust Flapper Protector Valve for 5" & 6" Inboard Thru-hull Outlet | Heavy Duty Rubber Protector Valve With Clamp Replaces Sierra 18-4458 GLM 89260 Prevent Water From Surging Into Exhaust System in Saudi Arabia Marine Exhaust Flapper Protector Valve for 5" & 6" Inboard Thru-hull Outlet | Heavy Duty Rubber Protector Valve With Clamp Replaces Sierra 18-4458 GLM 89260 Prevent Water From Surging Into Exhaust System in Saudi Arabia Marine Exhaust Flapper Protector Valve for 5" & 6" Inboard Thru-hull Outlet | Heavy Duty Rubber Protector Valve With Clamp Replaces Sierra 18-4458 GLM 89260 Prevent Water From Surging Into Exhaust System in Saudi Arabia

Marine Exhaust Flapper Protector Valve for 5" & 6" Inboard Thru-hull Outlet | Heavy Duty Rubber Protector Valve With Clamp Replaces Sierra 18-4458 GLM 89260 Prevent Water From Surging Into Exhaust System

SAR 216
Brand
NorthBoat
– 1 +

Special Features

  • 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.

Description

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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