Bulkhead Union Application Air Fitting Side A Connection Type Compression Fitting Side B Connection Type Compression Fitting Material Brass Fitting Side A Tube Outer Diameter 1/4 in Fitting Side B Tube Outer Diameter 1/4 in Maximum Operating Pressure 150 psi Maximum Operating Temperature 200 Degrees F Specific Fitting Shape Straight Bulkhead Union Thread Size B 1/8-27 System of Measurement Imperial Standards SAE J246 Compatible Tube Material Nylon