An O-ring face-seal tube fitting equipped with a metal sealing ring is designed for applications where typical elastomeric sealing is not a possibility due to extreme temperature.

Manufactured by Tube Fittings Division (TFD) of Parker Hannifin Corp., Cleveland, the Seal-Lok Xtreme O-ring can be used for applications such as cryogenic and chemical process equipment, LNG storage and fueling systems, and combustion turbines. The O-ring is designed for tube and hose connections at working pressures of up to 5,850 psi with temperatures from -328 to 1,200°F (-200 to 650°C).