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Bard 5603-007 is an OEM LP to natural gas spring kit used during fuel conversion on select Bard gas heating sections. This kit provides the correct regulator spring for the gas valve so the manifold pressure can be set properly when converting from LP to natural gas, helping restore safe ignition, stable flame, and reliable heating operation once the full conversion procedure and adjustments are completed per the Bard service instructions. Because gas conversions are model and valve specific, confirm compatibility by unit model and gas valve type before ordering, and have the conversion and final pressure checks performed by a qualified technician. Note: some sources list Bard 5603-007 as obsolete, so verify the current replacement part number if needed.