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