Tip Toe 1-1/2 in. NPSM Coarse Thread Integrated Overflow Bath Drain• 1-1/2 in. NPSM mushroom tip toe bath tub drain with integrated overflow• Coarse thread drain shoe• 1-1/2 in. NPSM (1-7/8 in. - 11-1/2 UNC) exterior• European style round full cover mushroom cap• Push down cap to close and restrict draining water• For use in bath tubs with integrated overflow channels cast into the tub shell during the bath tub manufacturing process• Heavy duty metal construction with adjustable plastic tip toe cartridge• Do not use plumber"s putty for installation