Universal Fine & Coarse Thread Exterior
· Bath tub trim set with tip toe drain plug and faceplate
· 1-5/8 inch O.D. fine thread exterior fits 1-3/8 inch NPSM (16 UNC)
· 1-7/8 inch O.D. coarse thread exterior fits 1-1/2 inch NPSM (11.5 UNC)
· Do not use plumber's putty for installation use silicone seal