Neptronic WM000 : Non-Spring Return Damper Actuator, 24 VAC/30 VDC, 4000 in-lb, On/Off, Floating Point, Modulating, PWM Programmable Control Input, Feedback, 8 Minute Run Time, IP56 Enclosure (Additional shipping or handling charges may apply. Contact sales@energycontrol.com for a quote.)