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Bard part 8603-038 is an OEM 1 inch FPT 24V electrically actuated brass ball valve with an end switch, used to positively open and close water flow in Bard HVAC applications where the control system needs proof of valve position before allowing the next stage of operation. This style of valve is commonly used on water side control circuits such as hydronic coils or geothermal water loops, helping prevent flow related faults and ensuring the unit only runs when the valve is commanded and verified. For proper fit, confirm the 1 inch female pipe thread connections, 24 volt control voltage, and end switch wiring match your Bard unit or service documentation before ordering.