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have had to run down to marina twice in the past two days to run bilge pump to drain whaler from loads of rainwater. Finally, last night I just left the plug out. But I dont like doing this. Its better than a foot of water in the boat, but not ideal.

Doesnt anyone make a one-way valve to replace the standard plug with? You know...something that lets accumulating water inside the hull drain out, but keeps sea water on the outside of the hull?

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Yes but I'm not sure they do for a Whaler. I've seen the screw in type with a check.

http://www.iboats.com/mall/?session_i..._id=237498

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Thanks. That idea would work, IF it had a screen on the inside to keep stuff from clogging the check ball. But I guess even clogged up with debris ( sand, pieces of conch shell etc.) it would be no worse than leaving the plug out.