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good insulation aging
6mm inner diameter for the hole
Easy to Install: With the rubber layers and micro-adjusting screw
Material: Nylon 66
The installation base made of zinc alloy which is anti-corrosion and anti-rust
2Pcs 4" to 3" Duct Reducer Ducting Airflow Tube Increaser Adapter Pipe Fitting 9mmx15mm good insulation agingThis duct pipe reducer connector is used to connect the pipes of equipment such as bathroom fans, range hoods and dust collectors to the ventilation duct system, you can connect two air ducts of different diameters to create a seamless ventilation system duct. Suitable in home, offices, kitchen, factory or apartments. Specification Color: White Material: ABS Height: 80 mm 3. 15 inch Inner Diameter: 100 x 75 mm 3. 94 x 2. 95 inch (Big*Small) Outer
