The T-H Marine Drain Plug is a self-retaining screw-type boat drain plug that's constructed of polypropylene and features a chemically inert "O" ring for positive sealing. Strong threads maintain sealing under high vibration conditions. Special design prevents cross thread. This drain plug mounts in a 1" diameter hole with two #8 countersunk stainless steel screws. The back side of mounting flange has a groove to hold sealant for positive waterproof mounting. Mounting flange is approximately 1-1/2" x 2".This drain plug is ideal for boat transoms, fish wells, bait tanks, water tanks, coolers, ice chests, or almost any application where a positive sealing drain plug is required. This drain plug is not only quick and simple to install, but it also provides a cost advantage over outdated, leaking flared-type drain tubes. This retained plug will not get lost.• Self-retaining• Threads prevent dislodging due to vibration• Ideal for transoms, fish wells, bait tanks, water tanks, coolers, ice chests, and more• Chemically inert "O" ring for positive sealingSpecsMaterial: PolypropyleneColor: WhiteMount: 1" dia. holeHardware: Two #8 stainless steel screws (not included)Flange Dimensions: 1-1/2" x 2" Strong threads maintain sealing under high vibration conditions Ideal for transoms, fish wells, bait tanks, water tanks, & more Mounts in a 1"" diameter hole | T-H Marine Drain Plug, White