I treated mine like a standard water system and used the readily available plumbing type flux and solder.

We use the same stuff in the industrial environment, but there again, our plant's, two 200hp compressors were built for a max of 100-110lbs output. To prevent pressure drops, the plant system uses a 4" main trunk (copper$$$) that makes a complete circle around the outer extremes of our 5 acre plant. Drops to most of the production equipment are 1/2" in diameter or larger.

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Dennis

65' STANG (3330 lbs), 393W, Toploader 4 Spd, 4:11, AFR 205's, Vic Jr. Intake, CI SR Cam, 950dp, 10.6 CR

11.21@124.0 al naturale

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