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 1/2 in, Fitting Side B Tube Outer Diameter 1/2 in, Maximum Operating Pressure 150 psi, Maximum Operating Temperature 200 Degrees F, Overall Length 2 29/32 in, Specific Fitting Shape Straight Bulkhead Union, Compatible Fitting Brands NTA, Thread Size A 11/16-20, Thread Size B 11/16-20, Series NTA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov -