Union, Application Air, Inert Gases, Non-Combustible Gases, Potable Water, Fitting Side A Connection Type Compression, Fitting Side B Connection Type Compression, Fitting Material Brass, Fitting Side A Tube Outer Diameter 3/4 in, Fitting Side B Tube Outer Diameter 3/4 in, Maximum Operating Pressure 550 psi, Maximum Operating Temperature 200 Degrees F, Overall Length 2 3/8 in, Specific Fitting Shape Straight Connector, Thread Size A 1-18, Thread Size B 1-18, Series Compression