For mounting only from inside transom. Fast-working, cam-action plug adjusts to provide tightest possible seal. Will not jar loose under vibration. Corrosion-resistant construction. Designed for use with Moeller drain tubes. Our Snap-Tite and Turn-Tite plugs have been the industry benchmark in bailer plugs for many years. Known for their durability and ease of use, these plugs provide boaters with a lasting seal on the water.