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Bard part number 8603-034 is an OEM actuator used with the Bard 8603-033 geothermal zone valve assembly, providing the powered open and close action that allows the control system to direct water flow through the proper circuit when heating or cooling demand calls for it. When an actuator fails, valves may stick, zones may not respond, and the system can short cycle or lose capacity, so replacing it with the correct Bard component helps restore reliable valve operation and proper hydronic flow control. Because actuator fit and wiring can vary by valve and control strategy, confirm the exact zone valve assembly and unit application before ordering to ensure proper compatibility.
* Orders less than $50 may incure a minimum order fee.