The 91420 seven piece accessory set is designed for general use with most brands of domestic, commercial, home shop, and central vacuums equipped for use of industry standard 32mm (1.25″) accessories. It is not suitable for use with European brand vacuums that have 35mm (1.375”) accessories and connections like Miele, or Sebo. You can confirm suitability with your vacuum by simply putting a ruler to the hose opening and confirming the outside measurement to be slightly less than 32mm. Typically the connection will taper slightly larger as you move back on the hose end to permit a snug fit. The nylon collar on the chrome extension tubes are designed to provide some flexibility to this connection. This set is compatible with major brands of central vacuums including Beam, Eureka, Vacuflo, Vacumaid, Cyclovac, MD, and Electrolux as well as home shop vacuums equipped with a 32mm hose including Numatic, Vax, Nilfisk, Shop Vac, Ridgid, Work Shop, and Craftsman. An ideal set of replacement accessories for many commercial backpack and commercial canister vacuums using 32mm accessories.