DuroZone 8 inch Round HVAC motorized air control damper - 3 wire 24V AC. Model RD-8 New in open box.
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Specs from site -
Durable Galvanized Steel Construction
High-Torque Motor will work with all existing 24-volt thermostats.
Low-Leakage, Single-Blade Design
Insures smooth operation and efficient sealing for maximum control of air flow.
Damper attaches to duct by use of nylon ties or screws. Easy wiring, no screwdriver required.
Round housing designed for use with flexible ducting or round duct.