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Cut it in the middle and replace it with 2 pieces with a union connecting them together.

New answerIf the galvanized pipe is used for Vent or waste and your local codes permit YOU can cut the pipe remove it and install a shorter piece connected with a NO HUB Coupling.

If the pipe is used for potable water cut out the galvanized pipe use a dielectric nipple then use a female x copper adapter to prevent electrolytic action

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Q: How do you replace a galvenised metal pipe which is threaded both ends?
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