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pipe arm adjuster, pipe shank adjuster, pipe arm equalizer
Explanation: "Rohrschenkel" seems to be used to describe the length of pipe extending from one side of a bend (see ref).
I think that "pipe arm" sounds better in the context. You would certainly refer to the two arms of U-bend rather than the two limbs. "Shank " is another word used for a protruding bit of metal.
What the "equalizer" is, is not at all clear without the context. Could it be a tool which trims the length of pipe on either side of the bend so that it is the same - in which case "adjuster" might be a better word to use.
Alternatively, could it mean another piece of pipe which is used to equalize the effect of having the "Rohrschenk" in the run of piping?