Union Application Potable Water Fitting Side A Connection Type Cup Fitting Side B Connection Type MNPT 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 Fitting Side B 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 ASTM B584 Alloy C87850 Third-Party Certified NSF/ANSI 61 Annex G