There is provided a system for preventing the movement of a clamping member, the system comprising a clamping member in moveable association with a first member, and at least one locking member moveably associated with said first member and said clamping member, wherein when said clamping member is moved towards the longitudinal axis of said first member, said at least one locking member is moveable towards the clamping member in order to prevent said clamping member from moving away from said longitudinal axis to its initial position.