Teflon tape should never be used on flare fittings, compression joints, or connections that utilize rubber O-rings and washers to achieve a watertight seal, such as flexible sink supply lines or garden hose ends. In those configurations, adding tape disrupts the precise mechanical fit required for the washer to seat correctly, resulting in leaks. Furthermore, you should avoid using standard white water tape on fuel, propane, or natural gas lines, as those critical connections require specialized yellow gas-rated tape. Using tape where it does not belong can also prevent fittings from tightening fully, risking structural damage to your plumbing.
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