Karl Timmermann wrote:
I have a binge pump I built for my kayak, and the holes where the water
spits out get water in them from the waves. I need to close this so the
kayak does not flood.

Why not just a one-way check valve? www.mcmaster.com search for check
valve, esp pages 382,383

--
William Smith
ComputerSmiths Consulting, Inc. www.compusmiths.com