Fitting Union Application Air Non-Potable Water Fitting Side A Connection Type Cup Fitting Side B Connection Type MNPT Fitting Side A Copper Tube Size 3/8 in Fitting Material Cast Bronze Fitting Side B Pipe Size 3/8 in Fitting Side A Tube Outer Diameter 1/2 in Fitting Side B Tube Outer Diameter 1/2 in Maximum Operating Pressure 623 psi @ 200 Degrees F Maximum Operating Temperature 400 Degrees F Specific Fitting Shape Straight Union