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Attwood Scupper 1-1/2 Thru TransomAttwood Part 38811Scupper 1-1/2 Thru TransomThru-Hull Scupper The popular 3876 scupper mounted to a 3875B 1-1/2 thru-hull as a complete assembly. Made of high-impact corrosion resistant plastic with rubber flapper valve that opens outward to dump water overboard and closes to help prevent backwash from entering coc..