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Bard part number 917-0005 is an OEM water coil assembly used in water source or hydronic-equipped Bard wall mount and packaged HVAC configurations where the unit relies on a water coil for heat transfer. Replacing a leaking, restricted, or internally corroded coil helps restore proper capacity, stable leaving air temperatures, and normal system pressures while reducing nuisance trips caused by poor heat exchange. Because coil assemblies can vary by unit series and vintage, confirm compatibility by matching the full Bard model and serial number or cross-referencing the unit parts list before ordering to ensure the correct connections and fit.