Union Application Potable Water Fitting Side A Connection Type Cup Fitting Side B Connection Type MNPT Fitting Side A Copper Tube Size 1 in Fitting Material Brass Fitting Side B Pipe Size 1 in Fitting Side A Tube Outer Diameter 1 1/8 in Fitting Side B Tube Outer Diameter 1 1/8 in Maximum Operating Pressure 395 psi Maximum Operating Temperature 400 Degrees F Specific Fitting Shape Straight Union Standards NSF/ANSI 61 Annex G Minimum Operating Temperature 20 Degrees F