Fitting Union Application Potable Water Fitting Side A Connection Type Cup Fitting Side B Connection Type FNPT Fitting Side A Copper Tube Size 1/4 in Fitting Material Bronze Fitting Side B Pipe Size 1/4 in Fitting Side A Tube Outer Diameter 3/8 in Maximum Operating Pressure 729 psi Maximum Operating Temperature 200 Degrees F Specific Fitting Shape Straight Union Standards ASME B16.18 ISO 9001 NSF/ANSI 372 NSF/ANSI 61 Minimum Operating Temperature 20 Degrees F