Independent movement for each pallet with A.C. motor and vector drives (wear-prone transmission elements have been eliminated – minimum maintenance and high reliability) All pallets are in pulling mode and the rubber blocks on them are shaped to provide the widest contact surface with the pipe. Upper puller pallets can be adjusted at an angle. Even with minimum pressure on the pallets, maximum pulling force is achieved with minimum pallet pressure due to the high contact available on the pallets.