View 2 of 12 in. Round Butterfly Damper and 6 in. round butterfly damper with collars (2 count)

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View 1 of 12 in. Round Butterfly Damper and 6 in. round butterfly damper with collars (2 count)View 2 of 12 in. Round Butterfly Damper and 6 in. round butterfly damper with collars (2 count)View 3 of 12 in. Round Butterfly Damper and 6 in. round butterfly damper with collars (2 count)View 4 of 12 in. Round Butterfly Damper and 6 in. round butterfly damper with collars (2 count)