Generic Hydraulic Tube Expander 7 Lever Tubing Expanding Tool Swaging Kit HVAC Tools No copper coupling needed any more, save cost material Only one side need to be welded Expand tubing from 10mm to 42mm diameter For inch:3/8'',1/2'',5/8'',3/4'',7/8'',1'',1-1/8''O.D.Tubing