A line-on glass type liquid crystal display panel that is adapted to prevent signal interference and electromagnetic interference between line-on glass type signal lines. The hose coupling device may include two flexible hose members coupled to the shield and the coupler, and a rigid hose member coupled between the flexible hose members, and a rod extended from the rigid hose member for adjustably securing to the table with one or more brackets. The piston head and needle move in unison by a flexible diaphragm engaged to and disposed above the head. Both the first and second portions have defined side walls and a front wall. The other component comprises an actuating device that is provided with pressing means, by means of which the valve body can be pressed to the bottom of the mount.