The Demco SBS Air Force One Coiled Air Jumper Kit for Freightliner BrakeSync-Equipped Chassis part # DM97ZR is for motorhomes that came with the Air Force One installed at the factory whereas the Replacement Air Jumper for Demco SBS Air Force One Supplemental Braking System part # SM99666 is just a replacement for the aftermarket version. view full answer...