The flat suction system and slit suction system are used at the same time, so there is no inhalation of fabric and it firmly absorbs allergens such as dust mites. Can be washed with water. Ideal for cleaners with a maximum suction rate of 50 W or more. Excludes types that do not have a true circle connection points or special connection methods such as commercial use. Threader Pipe Dimensions: Min. 1.2 inches (31.5 mm) to Max. 1.4 inches (37.0 mm); Spare Fittings: Min. 1.2 inches (30.0 mm) to Max. 1.3 inches (34.5 mm).