Professional plumbers do not use tape to stop active leaks on pressurized pipes, as tape cannot seal holes or cracks in pipe walls; instead, they use mechanical repair clamps, cut out the damaged section, or replace faulty pipe fittings entirely. However, when sealing threaded pipe joints during installation to prevent future leaks, plumbers use high-density polytetrafluoroethylene (PTFE) tape. Pink tape is typically used for standard water supply lines, while thicker yellow gas-rated tape is utilized for propane and natural gas connections. For temporary emergency patches on low-pressure lines, plumbers may apply self-fusing silicone tape or rubber repair wraps until permanent repairs are completed.
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