Screw Type Drain Plug Self-cleaning thread design, O-ring, and super strength center retaining legs to secure the center while draining. Ideal installation for transom of personal watercraft, small boats, fish wells, coolers, ice chests, water tanks, etc. Should be mounted in a 1" I.D. hole with two stainless steel fasteners and positioned with gap in thread at lowest point. Black with gasket. Hole cut: 1" Dimensions overall: 1-1/4" x 2"