This is a rebuilt gearbox. It has been disassemble, clean and replaced all the components that were bad including the seals and the bearings. The gearbox is in like new condition. Everything is in great shape. It has been repacked with fresh grease and is ready to go into your robot so it will Keep servicing you for years to come. I also sell kits for the main O-ring seal bags of desiccant and seals or the nose piece for your impeller pump. There are no returns on these items unless there is a manufacturer defect.