Response to Hello, JB. The Heat Exchanger 400 (IDXLHXA1400) PART# 6223-008 for the Hayward H-Series Low Nox Heater, does not include any extra parts or O-Rings. If you are looking to replace the O-Rings for Unions, please use Heater Flange O-Ring PART#  HAXFOR1930 (Set Of 2). Click here to view.

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