Universal reducer for ventilation systems, diameter 80 - 200 mm. Reducer connector reducer pipe diameter 80/90/100/110/120/130/140/150/160/170/180/190/200mm，gradually decrease or increase. Ventilation duct to; round transition vent pipe It can be used with an HVAC system: bathroom exhaust fan, built-in fan, range hood, clothes dryer, hydroponic system, kitchen or any other place in the apartment, house or from the office. The conduit pipe has several diameters，Reducer connector reducer pipe diameter 80/90/100/110/120/130/140/150/160/170/180/190/200 mm. The plastic is very soft but strong, so you can easily use the knife many times on the edge of the diameter of the required diameter without jamming or breaking the device in the wrong position Specification: Material: plastic Weight: 8-20CM: 160g 15 & 18 cm: 120 g Largest end of the reducer is female. of the reducer is safe and reliable. Light, fast and easy to use. install Suitable for; all the elements of the ventilation system It