Siemens 331-3018 Damper Actuator, Pneumatic, Number 4, 4" Stroke, 3 to 13 psi, Fixed Mounting Plate, Ball Joint Connector

Siemens 331-3018 Damper Actuator, Pneumatic, Number 4, 4" Stroke, 3 to 13 psi, Fixed Mounting Plate, Ball Joint Connector. Siemens Nos. 3, 4 and 6 Pneumatic Damper Actuators are heavy-duty, spring return actuators designed to drive large dampers and other applications requiring large diaphragm area and long stroke.