I believe j.d.a was the oringale mfg. In so ca. I've used them since the 70's. I've always backed them up with a plug if i left the boat in the water overnite, any lil piece will hold them open. My 2 cents. Andy p.s. Give rex a call
I just threw 6 of those away. No joke.
I would never trust a little rubber flap to keep my investment above water. Unless of course you have a boat that sits on the trailer all day. But then if that's the case why have anything at all?
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