22 00 00 Plumbing

22 30 00 Plumbing Equipment

22 31 00 Domestic Water Softeners 22 32 00 Domestic Water Filtration Equipment 22 33 00 Electric Domestic Water Heaters 22 34 00 Fuel-Fired Domestic Water Heaters 22 35 00 Domestic Water Heat Exchangers 22 36 00 Domestic Water Preheaters

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