View 2 of [2 Pack] Fits 6 Inch Neck Air Duct | Steel Butterfly Damper by Handua | for Round Ceiling Air Supply Diffuser with Plastic Key-Handle | Black | Outer Dimension: 7-1/2"

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View 1 of [2 Pack] Fits 6 Inch Neck Air Duct | Steel Butterfly Damper by Handua | for Round Ceiling Air Supply Diffuser with Plastic Key-Handle | Black | Outer Dimension: 7-1/2"View 2 of [2 Pack] Fits 6 Inch Neck Air Duct | Steel Butterfly Damper by Handua | for Round Ceiling Air Supply Diffuser with Plastic Key-Handle | Black | Outer Dimension: 7-1/2"