Reducing Adapter Application Air Gases Potable Water Fitting Side A Connection Type Cup Fitting Side B Connection Type FNPT Fitting Side A Copper Tube Size 5/8 in Fitting Material Wrot Copper Fitting Side B Pipe Size 5/8 in Fitting Side A Tube Outer Diameter 3/4 in Maximum Operating Pressure 631 psi @ 100 Degrees F Maximum Operating Temperature 400 Degrees F Specific Fitting Shape Reducing Adapter