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The Bard 8603-033 is a 24V, 3/4 inch FPT ball valve assembly with an end switch used on select Bard geothermal and hydronic HVAC applications to control water or loop fluid flow and provide position feedback to the control circuit. As an OEM Bard valve, it is built to match factory electrical timing and valve actuation so the unit can verify flow before allowing operation, helping prevent nuisance lockouts tied to flow or staging logic. When replacing, confirm your unit model and the required connection size and voltage so the valve threads in correctly and the end switch wiring lands on the proper terminals for reliable open and proof signals.