Teflon tape has a sealing function to prevent the leakage of water or gas., Teflon tape is a necessity for plumbers, when you use any threaded pipes
WOD Tape Plumbers Teflon Thread Seal Tape - 1/2 inch x 520 inch
Thread Seal PTFE Tape 1/2 x 520 x 0.0035 x 0.4g/cm3
70658 - Blue Monster 70658 - 1/2 x 520 Silver-Seal PTFE Thread
Teflon PTFE Thread Seal Tape 1/2 x 520 IMP Per Roll – Free Purity
Roll of Teflon Tape 1/2 – Star Supply USA
1/2 x 520 PTFE Plumbers Thread Seal Tape Pipe Joint Teflon Tape
Teflon Tape 1/2 x 520: : Tools & Home Improvement
TT520-05,HTST520-1/2XHD,AMERICAN GRANBY CO,Teflon Tape 1/2 x 520
Valley 1/2'' x 520'' White Teflon Thread Tape