Duck Bill Bailer Bung
AUTOMATIC SELF BAILER Rubber one-way flap with coarse threaded nylon nipple. Screws into coarse (square) thread standard bung bases. Will Start bailing automatically when the boat starts moving forward. The duckbill venturi effect gives a reduction in fluid pressure, thus helping to drain the boat while at speed. Designed for use on boats whose cockpit floors are above waterline or only when underway 8 knots plus.