These three adapters are none inside threads, so none need to cut or break hose ' s cuff for installing So your hose cuff could still be kept well and could connecting original accessories of your vacuum Our accessories could be connecting to both hose cuff and extension wand, and help convert your shop vacuum to a carpet extractor very quickly The clear accessory allows you and your customers to see the dirt being cleaned off their upholstery and view your dirty recovery work 1-1 / 4inch and 1-7 / 8inch adapters are mainly for small and middle size shop vacuum from 1-9 gal, but also for large size vacuum 2-1 / 2inch adapter is for large wet / dry vacuum from 10 to 20 gallon The large size 7-1 / 2inch width head could cover more area by wide way and save your time, is great tool for auto