Drain Plug 25 mm Through-hull Non-Return Valve, Black | 4Boats25 mm (1 in) through hull drain plug with an integrated non return valve and quick release action for fast, tool free bilge drainage. 25 mm bore fits 25 mm (1 in) through hull drain openings Integrated non return valve prevents backflow into the hull Quick release plug allows drainage without tools Black polymer body wipe clean with a damp cloth; avoid solvents and prolonged sun exposure Includes 1 drain plug with integrated non return valve Suitable