Marine 4" Exhaust Flapper & Clamp Backflow Preventer Flap Guard Valve MPI Brand. All stainless steel marine clamp.
Sierra 18-4457 MerCruiser 12644Q01 GLM 89250 Mallory 9-44001
Clamp Included
Replaces Part #s
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.
May not include factory packaging.
If you do not need a clamp see my listing for these without clamp.
These are new stock .
Contact me with any questions
I previously priced these at $16.99 and free shipping. People could not measure, and they would return them, and I could not recover my shipping cost. So, I cannot reduce the shipping cost on multiple orders.
Shipping quoted is for the contiguous 48 United States only.
Contact me for a shipping quote for Alaska, Hawaii, Puerto Rico, other
territories or elsewhere
Original shipping for returned items will not be refunded. If
the item was listed as free shipping, the original shipping cost paid by the
seller will be deducted from the refund. Item must be unused and in unopened in
original packaging if item included original packaging. A 20% restocking
fee may apply.