Siemens 331-3017 DAMPER ACTUATOR, PNEU NO 4, 4" STROKE, 8-13PSI, FIX MT PLATE, BALL JOINT CNCTRSiemens 331 3017 Damper Actuator, Pneu No 4, 4" Stroke, 8 13psi, Fix Mt Plate, Ball Joint Cnctr 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
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