One size: Multi-stage universal reducer for PVC pipe diameters of 120-150-160 mm. Simply cut the fitting to the desired size to resize the pipe and make connections. Convenient use: Adjust the diameter of ventilation ducts and connect different fixed or flexible ducts. Easily connect air ducts to fans, inline fans, and air conditioner exhaust ducts using various small and large tubes. Compatible with exhaust fans, clothes dryers, bathroom fans, and range hoods. Universal: Ideal for residential applications such as bathroom fans, range hoods, and garage ventilation. Suitable for both indoor and outdoor industrial ventilation systems. High-quality material: Made from durable PVC plastic that maintains its technical and aesthetic properties under various conditions. Resistant to rust inside and out. The material is strong, lightweight, and flexible for reliable long-term performance. Easy to install: Measure the required pipe diameter, then cut the fitting to the appropriate size. A saw is recommended for cutting. Insert the pipe into or over the connector to complete the connection. Use tape, glue, or zip ties if needed to secure the joint. Note: Measurements are taken manually; please allow 1–3 cm variation. Color may vary slightly due to lighting and display differences. Actual product may vary slightly in appearance. Delivery quantity based on the main image.