There are certain independent companies (Gr8Flex and United Outlets) offering Total Gym product attachments for sale. These companies are not affiliated with or authorized by Total Gym Fitness, LLC. Our Total Gym attachments are designed and intended for use on authentic Total Gym products only and not for use on any other product. Products purchased from these companies, or any other unauthorized source, will void the Warranty and we will not assume any liability for damages caused by using unauthorized products. We are committed to the safety and quality of our products but are not able to control these important factors when products are purchased from an unauthorized source.