The Switching Coupler is compatible with the classic G Gauge hook-and-loop coupler and features completely revised control electronics with a limit switch, a plug-in connection cable, a new type of uncoupler plate along with running boards, and a new coupler hook. It replaces the previous 8414002 Automatic Uncoupler.The Switching Coupler is compatible with the classic G Gauge hook-and-loop coupler and features completely revised control electronics with a limit switch, a plug-in connection cable, a new type of uncoupler plate along with running boards, and a new coupler hook. It replaces the previous 8414002 Automatic Uncoupler.