Siemens
Item ID: 331-4811
This 331 Number 3 Pneumatic Damper Actuator with integral pivot and pivot post is a rugged, metal-fabricated device that provides gradual or positive actuation of HVAC dampers.
This actuator has a nominal spring range of 8 to 13 psi, has extended shaft mounting and an ozone-resistant rolling rubber diaphragm.
This actuator has an air connection of 1/8" NPT female with a straight dual barb fitting for 1/4" OD tubing..