Hart & Cooley 3800 Butterfly Damper, Adjustable, Round, 6 Inch, For Use With: 5400 and 6400 Series Collars and T-Bar Diffusers, 5-11/16 Inch OD Diameter, 1-31/32 Inch Depth, 1/4 Inch Thickness, Steel, Golden Sand Enamel
- Adjustable butterfly damper with removable handle