Do you need some copper pipe to build your still column? This is the pipe you need. This is type M copper pipe. We also have copper ferrules that you can solder onto the end of this pipe to build your distilling column. This pipe is sold by the inch. The pipe that you receive may or may not be polished. You willalwaysreceive1pieceif you order from 1″ to 72″ unless yourrequestotherwise.OD is 2-1/8″