Attwood Thru Hull Scupper For Hose, White - 1-1/2" 

"The popular 3876 scupper mounted to a 3875B 1-1/2" thru-hull as a complete assembly. Made of high-impact corrosion resistant white plastic with flapper valve that opens outward to dump water overboard and closes to help prevent backwash from entering cockpit. Installation hole size is 2"."

Size: 6-1/4", Barb: 1-1/2", Max Hull Thickness: 3-1/8"

Sold: Each