331-2961
331 No. 4 Pneumatic Damper Actuator, UL recognized for fire and smoke applications; rugged, metal-fabricated device provides gradual or positive actuation of HVAC and fire/smoke dampers. 8 to 13 psi, integral pivot mounting, replaceable diaphragm; Air connection of 1/8" NPT female, dual barb elbow fitting for 1/4" OD tubing.
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