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I'll just link you. The elbows can fit into the pipes just fine without the bands but if you have more than a pipe or two above them without something else supporting the pipe it's probably a good idea to have the bands so you don't have to worry about shearing force.
I'll just link you. The elbows can fit into the pipes just fine without the bands but if you have more than a pipe or two above them without something else supporting the pipe it's probably a good idea to have the bands so you don't have to worry about shearing force.