Neptronic BM060 : Spring Return Damper Actuator, 24 VAC/30 VDC, 50 in-lb, On/Off, Floating Point, Modulating, PWM Programmable Control Input, Feedback, 20 to 30 Second Run Time, 20 to 30 Second Spring Return, NEMA 2 Enclosure (Additional shipping or handling charges may apply. Contact sales@energycontrol.com for a quote.)