Siemens 332-2856 DAMPER ACT, PNEU, NO 6, 4" STROKE, 8-13PSI, PIVOT MOUNT, CLEVIS, POSITION RELAYSiemens 332 2856 Damper Act, Pneu, No 6, 4" Stroke, 8 13psi, Pivot Mount, Clevis, Position Relay This 331 Number 6 Pneumatic Damper Actuator with positioning relay is a rugged, metal fabricated device that provides gradual or positive actuation of HVAC and fire smoke dampers. This actuator has nominal spring range of 8 to 13 psi, is pivot mounted and has a replaceable diaphragm. This actuator has a 1 8" NPT female air connection. Additional