Powerboats have gone back and forth on many different forms of swing check valves in rubber and metal
They always wear out with no real way to tell  and they have found a correct install with things at the correct height above the waterline solves most issues
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1970 Cal 29 Sea Fever
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1981 J24 Tangent 2930
Tommays
Northport NY
If a dirty bottom slows you down what do you think it does to your boat
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Last edited by tommays; 12-14-2010 at 11:41 AM.
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