Yes it can, but the Occiflex was not designed for traction, it was designed for mobilization.
In case your mobilization movement is directed proximal you initiate a traction movement.
However, one of the safety arguments of the Occiflex is that the patient can take his head out of the cradle at all times.
The patient is in controll, not the Occiflex (and that is why we allways give him/her the stop button).
This re-assures your patient and will result in better relaxation and thus a better treatment.
This argument vanishes of course once you start fixating your patient's head wich might be necessary if you do traction.
For proper cervical traction Enraf-Nonius recommends the Eltrac unit, most preferentially with the cervical traction device.