Permatex Thread Sealant with PTFE is an economical general-purpose fitting sealant that seals and resists pressure in air, oil, diesel fuel and hydraulic systems, outperforming tapes. With a temperature range of -65 degrees fahrenheit to 300 degrees fahrenheit it remains pliable at higher and lower temperatures and also resists common shop fluids. Suggested Applications: Air conditioning fittings, temperature sending fittings, hydraulic fittings.