One size: Multi-stage universal reducer for PVC pipe diameters of 120-150-160 mm. Simply cut the fitting to the right size to resize the pipe and connect itConvenient use: enlarge or reduce the diameter of ventilation ducts and connect different fixed or flexible ducts. Use various small and large tubes to easily connect air ducts to fans, inline fans and air conditioner exhaust ducts. Compatible with exhaust fans, clothes dryers and bathroom fans, range hoods.Universal: Ideal for homes and apartments for bathroom fans, range hoods, garage and other ventilation. Also suitable for indoor and outdoor industrial ventilation systems.High Quality Material: The connector is made of durable PVC plastic that maintains its technical and aesthetic characteristics under different conditions. And it doesn't rust inside or out. The material is strong, lightweight and flexible for comfortable and reliable long-term use.Easy to install: first measure the correct diameter of the pipe, then cut the fitting to the desired size. We recommend using a saw. The pipe is then inserted into the connector or over the connector to connect the pipe. You may need to use tape, glue, or zip ties to secure the connection."Note: The data are all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending the physical object received Delivery Quantity: (according to the main image)