Air Brake Fitting Application Air Fitting Material Brass Maximum Operating Pressure 225 psi Maximum Operating Temperature 200 Degrees F Overall Length 7/8 in Thread Size 11/16-20 Specific Fitting Shape Nut System of Measurement Imperial Compatible Tube Outer Diameter 3/4 in Standards DOT FMVSS 571.106 Fitting Connection Type Compression Minimum Operating Temperature 40 Degrees F