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Joe,
I looked up the pvc article. Looks like 5200 is the recommended sealant/adhesive. Pretty permanent stuff. By the pictures I do not see how you can use the plastic tubes with the 1984 Outrage. On my 1979 22' Revenge, all the through hull tubes have different angles on the flange. I am pleased with the brass tubing for my replacement. With care after, annealing the brass tubes ends, I was extremely pleased with my results with the steep angles. Would the Plastic tubes.....to work/waterproof correctly......have to have a pretty flat 90 degree surface to have them seat properly???? Some of my angles are pretty steep and using a filler to compensate would have them stick out pretty far.