This 35138 DuroZone motor is a direct replacement motor for power open/power close "RD" and "MS" Dampers. These motors have 90° cam travel to switch. Motors are new and shipped to us in bulk - they do not come with the DuroZone box pictured. Please note: If you have an older style Durozone Damper RD 3 wire Motor, Black with Five white terminals, the new RD motor p/n 35138 is a direct replacement with four terminals. Please see our other selections of DuroZone motors in our store, Retrozone. We have all Durozone replacement parts, if you do not see what you need, just send us a message via Amazon. All motors are new inventory and come with a two year warranty, and full service and support. From Retrozone, where zoning is our only business! We offer the service, support, and technical resources to help you design or service your Zone Control System. We handle all major brands including Durozone, Honeywell, EWC, Retrozone, Enerzone Systems Corp., Robertshaw, Invensys and more. If you dont see it on ebay, please message us via Amazon.