Skip to content
USA Classification Hub
Legacy NAICS 2017 USA
Code
423720

Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers

Legacy entry preserved as a historical layer and reverse lookup target.

Modern match: 423720 Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers

Related SIC

3430 HEATING EQUIP, EXCEPT ELEC & WARM AIR; & PLUMBING FIXTURES 3433 HEATING EQUIPMENT, EXCEPT ELECTRIC & WARM AIR FURNACES 3690 MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES 3843 DENTAL EQUIPMENT & SUPPLIES 3861 PHOTOGRAPHIC EQUIPMENT & SUPPLIES

Official data

Feature Description
Official name North American Industry Classification System (NAICS) 2017
Maintained by U.S. Census Bureau with North American statistical partners
Purpose Historical business classification used before the 2022 NAICS revision
Primary use Legacy filings, archived datasets, historical contract and census records
Status Retired for current federal use; preserved here for reverse lookup and comparison

When do you need NAICS 2017 code 423720?

1 Use NAICS 2017 code 423720 when an older report, grant file, or contract still cites this legacy edition.
2 Use it when reconciling historical business data with current NAICS 2022 classifications.
3 Use it when a state or local registry still stores older NAICS values and you need the modern equivalent.
4 Use it to compare how an industry definition changed between the 2017 and 2022 revisions.