Head Lock Standard with Brass Body and 30 Power Cord

Head Lock. The Head Lock Glow Plug Connectors feature the original patented spring loaded "Twist-Lock" design and heavy duty power cords. In mid-2000 they were upgraded with stronger springs. To attach to a glow plug you simply push down and turn. The Head Lock can be powered by any 1.2V to 1.5V battery or power panel.