Great idea but the brush diameter is not wide enough. Tried on 3 household drains. The brush does not fit snugly enough against the inside walls of the pipe to knock off material stuck to the pipe. If the brush was a bit wider it would work much better. Anyway, you can't push the brush against the pipe walls because the shaft is flexible. It only flexes when you try to rub the sides of the tube up and down.
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