I tried these and they just did not work very well, they kept water out, but drained really slowly, now I just put plugs in the drains when we are stopped in the ocean and pull them when water gets on the floor so they drain.
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Stay Safe!
Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.