Union, Application Gasoline, Oils, Potable Water, 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 5/16 in, Maximum Operating Pressure 200 psi, Maximum Operating Temperature 250 Degrees F, Specific Fitting Shape Straight Reducing Connector, Thread Size A 9/16-24, Thread Size B 1/2-24, System of Measurement Imperial, Standards NSF/ANSI 61 Annex G