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I am wondering if it is a must to use steam fitting (cast) over black pipe fittings. The reason for this question is we are having this discussion at work and I have always been told you must use steam fitting, I am also being told that supply houses are only selling black iron fittings now for steam not cast fitting.I need this dilema put to rest please help and if possible be specific so this discussion at work can go to bed.Thanks for your assistance.