NTB7L - BreakFree Power Tube Bender for Soft Copper TubingNavac NTB7L BreakFree Power Tube Bender for Soft Copper Tubing It is a tough and frustrating job for HVAC Service Techs when bending large diameter tubes, which consumes tremendous labor work while needs precise focus on bending angles. Furthermore, to get the tube out of a traditional bender mandrel is another frustrating moment. Suitable for tubing sizing 1 4" to 7 8" OD, NAVAC NTB7L saves tons of your time and labor, and makes the job much easier.