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I am just a diy'r. I am trying to properly size the gas piping for my house, I am redoing most of it for various reasons. Largely because local codes make plumbers get special gas permits, and they then charge accordingly... Anyway, I have looked through many forums on pipe sizing, read codes and guidelines and feel like I understand how to size for length and demand. What I am confused about is how to account for length equivalency of fittings especially T's with multiple output Internal diameters. For instance if I have a T that is 1" in with a 3/4" out and a 1" out is it a 1" T Leq or something else?