Union Application Air Fitting Side A Connection Type Compression Fitting Side B Connection Type Compression Fitting Material Brass Fitting Side A Tube Outer Diameter 1/2 in Fitting Side B Tube Outer Diameter 1/2 in Maximum Operating Pressure 150 psi Maximum Operating Temperature 250 Degrees F Overall Length 2 31/32 in Specific Fitting Shape Straight Union Thread Size A 11/16-20 Thread Size B 11/16-20 System of Measurement Imperial Standards DOT SAE Compatible Tube Material Copper