331-3017 | Damper Actuator, Pneu No 4, 4" Stroke, 8-13psi, Fix Mt Plate, Ball Joint Cnctr | Siemens

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 8 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.