A rotating asynchronous converter and a generator device having a first stator connected to a first AC network with a first frequency f1, and a second stator connected to a second AC network with a second frequency f2. Numerous products in a store are merchandised on shelves and a biased pusher is used to urge products toward the front edge of the shelf. The gasket surrounds a portion of the trigger within the lower receiver without impeding the movement of the trigger.