I think the pvc is basically just a form for glass. I glassed over mine with 4 layers of 1708 overlapped like 8, 10, 12 , , 14 thereabouts . With a nice thick fillet. Very strong. Also, acts like a drain tube of sorts. I ran a hose from my anchor locker drain into the tube and filled the cavity under the fish box with 2 lb pour foam.
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