Libra Supply DWV Wrought Copper 1-1/2'', 1-1/2 inch, 1-1/2-inch Male Adapter C x M, (Pack of 5 pcs, click in for more size options)DWV Copper Pressure Pipe Fitting Plumbing Supply For use with DWV systems, Use with type DWV hard-temper tubing (not included) Male adapter adapts to standard female pipe thread using sweat connection C x M copper to copper connection type Long sweep helps the gravity flow of waste materials Fitting ID Size: 1-5/8'' (OD 1-3/4''), Fitted Pipe ID Size: 1-1/2'' (OD 1-5/8'')