Pipe scrub nozzle.
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Previously:
https://www.homemadetools.net/forum/...569#post143150
https://www.homemadetools.net/forum/...427#post131603
https://www.homemadetools.net/forum/...431#post122276
https://www.homemadetools.net/forum/...058#post125592
https://www.homemadetools.net/forum/...505#post135848
