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The Siemens 331-947 linkage kit is a pneumatic damper actuator accessory that includes a 4 in. rod, ball joint, and crank for damper linkage. The kit fits 3/8 in. to 1/2 in. diameter damper shafts and is intended for use with No. 3, No. 4, No. 5 and No. 6 pneumatic damper actuators, including No. 6 tandem actuators. Typical application is HVAC damper control linkage.
4 in. rod linkage kit for Siemens pneumatic damper actuators #3, #4, #5, #6; includes ball joint and crank
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