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My journeyman swore by WD-40 on stuck conduits, cost me a $220 call back
Turns out soaking a rusted EMT coupling in it just made the pull rope slip and snap, so now I'm asking anyone in Phoenix, what do you actually use for seized fittings?
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harperb462mo ago
Skip the sprays entirely and grab a plumbing torch. I mean, heat the coupling itself with a map gas torch until it just barely starts to glow, then hit it with a wet rag. That thermal shock breaks the corrosion bond way better than any lube. Just be careful around fire stops or anything flammable, but I've popped year-old ridgid fittings loose this way when every penetrating oil on the shelf failed.
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