Aluminum Duct Increaser/Reducer

Aluminum Duct Increaser/Reducer
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Price: $2.94
Product ID : DIRB43
Manufacturer: Deflecto
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Do you need to connect two different diamater ducts?
This deflecto Aluminum Increaser/Reducer (DIRB43) is the perfect accessory. The aluminum increaser/reducer connects 3 inch duct to 4 inch duct. The 3 inch and 4 inch easily slips over the aluminum increaser/reducer.