Teflon tape—generically called PTFE or pipe thread tape—is a thin, “stretchy,” tape you wrap around pipe threads before screwing them to their counterparts. It doesn’t have a sticky side, but rather clings to the pipe and itself as you wrap it tightly around the threads.
Teflon tape does two important things: One, it acts as a sealant to plug small gaps that might be present after the joint is assembled; and two, it acts as a lubricant so the pipe goes together more easily initially and also comes apart more easily when disassembled.
Used to seal water, air, gas from leaking through threaded connections that don’t have a built in rubber seal.
Used to seal pipe threads being joined together for plumbing jobs
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