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331-2905 | Damper Actuator, Pneumatic, Number 4, 4" Stroke, 3-7 psi, Integral Pivot Mount | Siemens Additional Information_0.7 x 1.31 in Center to End 2 PVC UNION 2000 SOCXFPTDamper Actuator, Pneumatic, Number 4, 4" Stroke, 3 7 psi, Integral Pivot Mount Pneumatic Model No. 4 Spring Range 3 13 psi Ball Joint Connector NO Clevis NO 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.