Effectively seal your pipe threads with Weld-On Thread Seal Tape with PTFE. This plumber’s tape is made with hydrophobic PTFE to repel water for a secure seal. Ideal for use in pressurized water systems, central heating systems, and air compression equipment, this seal tape prevents rusting and seizing, reduces friction between pipe and fitting, and makes it easier to unscrew the joint. Weld-On Thread Seal Tape comes in a variety of spool sizes to fit any application.