Check the listing for details. 4" to 2" Round Duct Fitting Pipe Increaser Reducer Adapter Connector. Condition: New. Listed at 20.37 USD. [WHAT TO GET]: Pipe reducers are made of PVC with an overall polished finish. Thickened and durable, they are resistant to wear and pressure, moisture, cold, corrosion, aging, and deformation. They are durable and designed for long-term use. These pipe connectors can be used to connect two pipes of different diameters.[WHEN/WHERE TO USE]: This duct reducer is widely used for plastic vent ducting and flexible vent hoses in drainage and ventilation (DWV) systems, heating, ventilation, and air conditioning (HVAC) systems, bathroom or kitchen exhaust fans, cooktop hoods, tumble dryers, hydroponics, and more. It's suitable for homes, offices, kitchens, factories, or apartments.[WHAT IT IS]: 1pcs Duct Pipe Reducer Connectors; Color: White; Material: Polyvinyl Chloride ; Inner Diameter: 50mmx110mm/1.97"x2.