Marine Exhaust Flapper Protector Valve Sierra 18-4457 GLM 89250 Mallory 9-44001 12644Q01
Replaces Part #s:
Sierra 18-4457
Mercruiser 12644A 12644A1 12644Q01
Mallory 9-44001
GLM 89250
Sierra 18-4457
Mercruiser 12644A 12644A1 12644Q01
Mallory 9-44001
GLM 89250
The ID is 4" to fit over 4" OD pipe or thru hulls.