Use with copper, brass, aluminum, or steel tubing. Resists mechanical pullout. Easy to disassemble and can be reassembled many times with no effect on the seal. Primary uses fuel equipment, plumbing, gases, refrigeration and vacuum. Tube O.D. size: 3/8" Thread size: 9/16-24 Temperature range: - 65 to +250 degree F Two piece construction - nut and body Use with copper, brass, aluminum, or steel tubing Resists mechanical pullout Easy to disassemble and can be reassembled many times with no effect on the seal Primary uses fuel equipment, plumbing, gases, refrigeration and vacuum. How To Assemble: Cut Smooth, square end on tubing Slide nut onto tube-thread facing end Flare end of tube Thread nut to body until snug. then 1/6th turn.