increasing bulkhead thickness

I am doing an undercurrent system with some brute totes but the wall thickness is too small for 3" uniseals. I bought some rubber sheeting to increase the bulkhead thickness. My question is should the rubber sheet go on the outside between the manufactured head or the inside of the uniseal that expands? Hope this makes sense, I tried searching for an answer but no luck.
 

SeedHo

Well-Known Member
never done it, never even thought of doing it. i think if you put it on the inside it would have pressure from the water push it against the wall vs it on the outside the pressure pushing it into nothing. that is my abstract thoughts about.
 
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