This 331 Number 6 Pneumatic Damper Actuator with integral pivot and pivot post 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 8 psi, is mounted on a plate which allows extended shaft mounting and has a replaceable diaphragm. This actuator has a 1/8" NPT female air connection and parts for frame mounting.