Solder DWV Couplings Application Drain Vent Waste Non-Potable Water Fitting Side A Connection Type Cup Fitting Side B Connection Type Cup Fitting Side A Copper Tube Size 4 in Fitting Side B Copper Tube Size 4 in Fitting Material Copper Fitting Side A Tube Outer Diameter 4 in Fitting Side B Tube Outer Diameter 4 in Specific Fitting Shape Straight Coupling Includes Center Stop Dimple Center Stop Standards ASME/ANSI B16.22 MSS SP-104 NSF/ANSI/CAN-61 Compatible Tube Material Copper