Solder Pressure Adapters Application Potable Water Fitting Side A Connection Type Cup Fitting Side B Connection Type FNPT Fitting Side A Copper Tube Size 3/8 in Fitting Material Copper Fitting Side B Pipe Size 3/4 in Fitting Side A Tube Outer Diameter 3/8 in Fitting Side B Tube Outer Diameter 7/8 in Specific Fitting Shape Straight Adapter Standards ASME/ANSI B16.22 MSS SP-104 NSF/ANSI/CAN-61 Compatible Tube Material Copper