Bulkhead Union Application Gases Liquids Fitting Side A Connection Type Compression Fitting Side B Connection Type Compression Fitting Material Brass Fitting Side A Tube Outer Diameter 3/8 in Fitting Side B Tube Outer Diameter 3/8 in Maximum Operating Temperature 400 Degrees F Overall Length 2 15/32 in Specific Fitting Shape Straight Bulkhead Union Compatible Fitting Brands CPI Thread Size A 9/16-20 Thread Size B 9/16-20 Series CPI(TM) System of Measurement Imperial