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331-2968 | Damper Actuator, Pneu No 4, 4" Stroke, 8-13psi, Integral Pivot Mount, Clevis | Siemens Inlet to Outlet Length_2.48 in 3/8 FNPT 5LB CBN STLDamper Actuator, Pneu No 4, 4" Stroke, 8 13psi, Integral Pivot Mount, Clevis Pneumatic Model No. 4 Spring Range 8 13 psi Ball Joint Connector NO Clevis YES Mounting Style Pivot Pivot YES Pneumatic Bracket NO Positioning Relay NO Stroke 4 in Resources Datasheet(Powers Controls No. 4 Pneumatic Damper. Technical Instructions)Datasheet(Pneumatic Damper Actuators Submittal Sheet)Datasheet(Powers Controls Maximum Thrust Ratings of Pneumatic Damper TB 181.