Collection: Marine Plumbing & Ventilation - Thru-Hull Fittings
A Thru hall fitting can be used to expel waste water, such as from a sink. You can check the thru hull fitting first when scraping the paint from the metal and if it looks golden and not pink it is in good shape. If the metal is pink, the thru hull fitting should be replaced immediately, since the metal has no strength and is ready to fail.