Yes, standard WD-40 multi-use product can help loosen stuck, corroded, or rusted threaded pipe joints and stuck nuts by penetrating into the micro-threads and displacing moisture. However, it is primarily a temporary penetrating solvent and water displacer. For potable water pipes and fixtures containing rubber seals or O-rings, petroleum-based WD-40 should be used cautiously because it can degrade rubber over time. Verification: Allow the penetrant to sit for 15 minutes before attempting to turn threaded fittings with a wrench.
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