Siemens 331-4821 No. 3 Pneumatic Actuator, 8 to 13 psi, Extended Shaft Mounting, 2-3/4-inch Stroke

Siemens 331-4821 No. 3 Pneumatic Actuator, 8 to 13 psi, Extended Shaft Mounting, 2-3/4-inch Stroke. 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.