Mounts real easy to Bell box. Mine goes to relay to furnace. Upon LOSS of AC power relay drops out and I hook inverter to L5-15P and I have heat. As soon as power comes back it disconnects inverter instantly and I just twist and remove outlet or inlet or what ever plug. Furnace room is always moist so locking covered inlet is nice to keep terminals nice and clean. I have another one I use for Honda eu-2000i gen set even though it is 16 or 17 amp generator, but I need only 7.5 amp from gen set for back up power anyways. I use dual L5-15P outlet in my shack for it plugs in and stays in nicely.