Automatically seals and drains self bailing decks. Made of polycarbonate material. Solid polyethylene ball and PVC seal mounts on transom above water line. 18271 and 18291 designed to retrofit Model 18261.

50-18271: Small, clear, fits 3/4" - 1-1/2" openings 

50-18281: Large, clear, fits 1-1/2" - 3" openings 

50-18291: Small, black, fits 3/4" - 1-1/2" openings