Marine 4" Exhaust Flapper & Clamp Backflow Preventer MPI Brand 18-4457 89250

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Marine 4" Exhaust Flapper & Clamp Backflow Preventer Flap Guard Valve  MPI Brand. All stainless steel marine clamp.<br>Sierra 18-4457 MerCruiser 12644Q01 GLM 89250 Mallory 9-44001<br>Clamp Included<br>Replaces Part #s<br>Sierra 18-4457<br>Mercruiser 12644A 12644A1 12644Q01<br>Mallory 9-44001<br>GLM 89250<br>The ID is 4" to fit over 4" OD pipe or thru hulls.<br>May not include factory packaging.<br>If you do not need a clamp see my listing for these without clamp.<br>These are new stock .<br>Contact me with any questions<br>I will combine shipping on multiple orders<br>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<br>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<br>. A 20% restocking fee may apply.<br>