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I used standard pvc pipe coated with 4200 on most of it. on the last 1" of both tube end's I used "Marine tex", and finished it with a finger dipped in mineral spirits, and wiped it clean. It turned out great. Upon inspecting the rotted tube that I removed, a co-worker pointed out that it was not "Brass" but, a standard 1" piece of copper heating pipe (a poor repair job from a previous owner).