Rectorseal 23431 Pint Brush Top T Plus 2&nbsp;Pipe Thread Sealant Contains Teflon, and synthetic fibers for a stronger seal For use on natural gas, lp gas, refrigerants, water, fuels, oils, etc Made in United states Non-hardening thread sealant containing PTFE plus synthetic fibers These fibers dispersed in a resinous base combined with inert mineral fillers provide maximum sealing performance Its low coefficient of friction allows tighter joint makeup with lower torque It also breaks out easily without galling, seizing, or damaging threads It is excellent for service where immediate pressurization is necessary