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 it. Convenient 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, bathroom fans, and range hoods. Universal: Ideal for homes and apartments for bathroom fans, range hoods, garage, and other ventilation applications. 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. It does not 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. A saw is recommended. The pipe is then inserted into or over the connector to form the connection. Tape, glue, or zip ties may be used to secure the connection. Note: Measurements are manually taken; please allow 1–3 cm variation. Color may vary slightly due to lighting and display differences. Delivery quantity as shown in the main image.