Thread seal tape, also known as PTFE tape/plumber's tape, is a thin film made of polytetrafluoroethylene (PTFE). It's often used in plumbing to seal the threads of pipe connections, which helps to prevent leaks in joints and fittings. It's applied by wrapping it around the male threads of pipes or fittings before screwing them together, providing a tight seal that helps to prevent water or gas from escaping