Invalidating a warranty based on such seals is in fact illegal: Generally, tie-in sales provisions aren’t allowed. These are provisions that state or i

Invalidating a warranty based on such seals is in fact illegal: Generally, tie-in sales provisions aren’t allowed. These are provisions that state or imply that a consumer must buy or use an item or service from a particular company to keep their warranty coverage. Here are some examples of prohibited tie-in sales provisions. “To keep your new Plenum Brand Vacuum Cleaner warranty in effect, you must use genuine Plenum Brand Filter Bags. Failure to have scheduled maintenance performed, at your expense, by the Great American Maintenance Company, Inc., voids this warranty.” “This limited warranty shall not apply if the warranty seal has been broken, removed, erased, defaced, altered, or is otherwise illegible,” where a device cannot be repaired without such effects. https://www.ftc.gov/business-guidance/resources/businesspersons-guide-federal-warranty-law https://www.ftc.gov/business-guidance/resources/businesspers...