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The Bard 8603-006 is a 24VAC solenoid valve assembly with 1 inch FPT connections used to open and shut off water flow in Bard geothermal equipment, helping the heat pump control loop circulation for proper heating and cooling operation. This OEM Bard valve is commonly referenced as a normally open style and is used on select Bard geothermal models such as WPV48D and WPV60D, making it a dependable replacement when a valve is sticking, leaking, or not responding to the 24-volt control signal. Confirm your unit model and the required valve configuration before ordering to ensure correct fit and operation.