Y not just use pvc primer and glue for the plug? I hate teflon tape and just permenatly glue all my hard line fittings.
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Because, if its a crack in the bulkhead itself, you'll never be able to back it out. It's very permanent. Teflon tape will at least let you know if the leak is within the threads or not. Then you can choose to make it permanent later.
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