What is commonly used as a sealant in plumbing joints to prevent leaks?

PTFE tape, commonly known as Teflon tape, is widely used in plumbing to create tight seals on threaded joints. The tape is made from polytetrafluoroethylene, which is a durable and non-stick material that helps fill any gaps between the threads of the pipes, preventing leaks. When wrapped around the threads of a pipe, PTFE tape provides a reliable barrier that resists water and other fluids, ensuring that the connection remains watertight.

Its effectiveness is particularly notable in connections that require disassembly, as PTFE tape does not harden like some other sealants, allowing for easy removal without damaging the threads. This tape is also resistant to a wide range of chemicals, making it suitable for various plumbing applications.

While silicone caulk, epoxy putty, and rubber gaskets have their specific uses in plumbing, they do not replace PTFE tape for threaded connections. Silicone caulk is typically used for sealing around fixtures and in areas where flexibility is needed but may not be suitable for high-pressure joints. Epoxy putty is used for repairing leaks rather than sealing threads and can harden permanently, making it difficult to disassemble. Rubber gaskets are used in flanged connections or where a flat surface is presented, but