The conical design makes attaching the Plymovent Magnetic Grabber to the vehicle extremely user friendly. At the sound of a clear “click” you know you have a correctly “sealed” connection of the system to the vehicle, minimizing the danger of diesel exhaust emissions in the station. The strategically positioned magnets ensure a good connection to the vehicle, as well as a controlled automatic disconnect when the vehicle exits the station. For more information, go to https://www.plymovent.com/us/vehicle-exhaust-extraction/products/vehicle-exhaust-extraction/nozzles/magnetic-grabber