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Add to CartThe Perko 0343DP Adjustable Thru-Hull Scupper provides a drainage outlet with a recessed soft black flapper to help limit backwash. Made from molded white polymer, it accommodates mounting surfaces from 2 to 4-3/4 inches thick.
The female section can be shortened by one rib for each 1/4-inch reduction from the maximum 4-3/4-inch surface thickness.
Installation Note: Perko does not recommend this thru-hull connection for use below the waterline.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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