ElectroluxA (R) Oxygen Belts (2 Pack) Fits Models - Oxygen 3 Upright (EL5035A) . Change every 12 months. AirFilters.com These ElectroluxA (R) Oxygen 3 Belts fit Models - Oxygen 3 Upright (EL5035A) . Each Belt ensures the continued high performance of your ElectroluxA (R) upright. Each package includes 2 belts. For optimum performance, it is suggested to change your belt every 12 months! This vacuum belt is designed to keep your vacuum cleaner running up to 12 months before it needs replacing! Purchase one for your vacuum cleaner today!