FASPARTS Tube Coupling Swivel 3/8 Tube OD FFL Swivel SAE 45 Flare fitting Automotive, Truck, HVAC, Refrigeration, Natural Gas, LP Gas Water, Air, Gas, Power Steering, Oil. Used with Copper, Aluminumn, and Welded Steel Hydraulic Tube. Working Temp: -65*F to 250*F (-54*C-120*C) Hydraulic brake fitting, power steering, gas lines, fuel lines, compressor repair, natural gas, propane.