Nutone Microlined Central Vacuum Bags 391, CF391 6/gal Allergen by Envirocare 3PK # 505 Vacuum Cleaner Bags, 3 / Pack Code # 505 Fit in Model = all models including CV350, CV353, CV450, CV750 except CV850 Made from quality material to keep you vacuum safe and in working condition all the time. 100% satisfaction guarantee with your purchase. We offer a 30-day money back guarantee. Buyer is responsible for return shipping.