When Should You Avoid Using Teflon Tape on Plumbing Fittings?
Learn when not to use Teflon tape, including on compression, flare, and plastic fittings, to ensure proper sealing and prevent damage.
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Teflon tape or PTFE tape should not be used on compression fittings, flare fittings, or plastic connections. Compression fittings rely on a metal-to-metal seal which Teflon tape can hinder, while flare fittings achieve seals through mechanical deformation. Using Teflon tape on plastic can cause over-tightening and cracks. Instead, use appropriate thread sealants or gaskets for these applications.
FAQs & Answers
- Why shouldn’t Teflon tape be used on compression fittings? Because compression fittings create seals through metal-to-metal contact, Teflon tape can interfere with this seal, leading to leaks.
- Can Teflon tape be used on plastic pipe connections? Using Teflon tape on plastic connections is not recommended as it can cause over-tightening, which may crack the plastic.
- What should be used instead of Teflon tape on flare fittings? Flare fittings achieve seals through mechanical deformation, so it’s best to avoid Teflon tape and rely on the fitting’s design or appropriate sealants.