Thread Sealant Tape - Parker PS-PTFE Tape

Polytetrafluoroethylene, or PTFE, film is cut to
specified widths for use in sealing pipe threads. The
tape is wrapped around the exposed threads of a pipe
before it is screwed into place.
The tape is commonly used commercially in
pressurised water systems as well as in air
compression equipment and thread joints with coarse
threads.
One of the defining characteristics of PTFE is how
good it is at defeating friction. The use of PTFE tape in
tapered pipe threads performs a lubricating function,
which more easily allows the threads to be screwed
together, to the point of deformation, which is what
creates the seal.