Imperial 4 in. D Galvanized Steel Duct Adapter, Pack of 6

This Imperial Duct Connector is used to join two lengths of 4-in flexible duct together to increase the overall length. The duct connector is crimped at both ends to help ensure a snug and reliable connection when placed into the end of each piece of duct. Made of heavy-duty galvanized steel, the duct connector resists rust and is designed for lasting use.