Keep your deck dry all the time by adding these thru-hull scuppers. The one way scuppers allow water to exit without re-entry. Made from a white UV protected plastic with a neoprene scupper. Not designed to be mounted below the waterline. Fits into a 1 13/16'' hole and decks as thick as 3 11/16''. Takes 1 1/2'' hose. Sold individually.