Tube Insert, Application Air, Air Brake, Compatible Fitting Connection Type Compression, Compatible Tube Outer Diameter 3/4 in, Compatible Tube Inner Diameter 9/16 in, Fitting Material Brass, Maximum Operating Pressure 150 psi, Maximum Operating Temperature 200 Degrees F, Overall Length 1 1/32 in, Specific Fitting Shape Tube Insert, System of Measurement Imperial, Standards DOT/SAE J1402A, Minimum Operating Temperature 40 Degrees F