Siemens
Item ID: 331-3018
This 331 Number 4 Pneumatic Damper Actuator with a ball joint connector is a rugged, metal-fabricated device that provides gradual or positive actuation of HVAC and fire/smoke dampers.
This actuator has a nominal spring range of 3 to 13 psi, a fixed mounting plate and a replaceable diaphragm.
This actuator has an air connection of 1/8" NPT female with a dual barb elbow fitting for 1/4" OD tubing..