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The Siemens 331-431 an integral pivot and post, is a compact, metal-fabricated pneumatic damper actuator. It effectively controls HVAC dampers with a nominal spring range of three to seven psi. The actuator's air connection fits 1/8 inch NPT female with a dual barb fitting for 1/4 inch OD tubing, ensuring versatile and reliable functionality in commercial building settings.
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