331-4312 | Damper Actuator, Pneu, Number 3, 2-3/8" Stroke, 3-7 psi, Integral Pivot Mount | Siemens

This 331 Number 3 Pneumatic Damper Actuator is a rugged, metal-fabricated device that provides gradual or positive actuation of HVAC dampers. This actuator has a nominal spring range of 3 to 7 psi, has integral pivot 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.