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Southwark Metal 156D4 is a spin collar with an integrated manual damper designed for 4-inch duct connections. The fitting is steel with a hot-dipped galvanized finish and a 6 in overall length. The damper includes a locking handle and a 5/16 in damper hole; the bead-to-crimp distance is 2-1/4 in. Intended for duct applications that require spin-in connection and localized airflow control.
4 in steel spin collar with manual locking damper, hot-dipped galvanized finish, 6 in overall length
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