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a test plug is an expansion plug with a pipe fitting in the top. it is used when a line needs to be pressure tested. the mechanical plug is what you are after. it has a rather large wing nut on one end. as you tighten the wing nut it presses against the rubber bellows and expands it, sealing the pipe. There is NO pressure in the waste line. Maybe a slight vacuum when its in use but no pressure.
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