A protective liner for a truck bed, and a method for making the same. The sub-portions of each portion are linked to one another in a sequential arrangement wherein each subsequent sub-portion contains further information on the topic. The shaft of throttle valve is in line with auxiliary gas passage and is extended into the auxiliary gas passage to form an automatically regulated valve. An electrical box is connected to the tubular members by a clamp and outer clamping fasteners, which can be loosened to adjust the length of the adjustable mounting bar. In order to manipulate the flexible array, a locking mechanism is mounted on the proximal end of the injection catheter for engagement with the flexible array.