Siemens 332-2973 DAMPER ACTUATOR, PNEU NO 4, 4" STROKE, 5-10PSI, INTEG PIVOT, UNIV MT, POS RELAYSiemens 332 2973 Damper Actuator, Pneu No 4, 4" Stroke, 5 10psi, Integ Pivot, Univ Mt, Pos Relay This 331Number 4 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 8 to 13 psi, a replaceable diaphragm and an air connection of 1 8" NPT female with a dual barb elbow fitting for 1 4" OD
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