| Naics index | Naics index description |
|---|---|
| 238220 | Plumbers |
| 238220 | Plumbing and heating contractors |
| 238220 | Plumbing contractors |
| 238220 | Plumbing fixture installation |
| 238220 | Process piping installation |
| 238220 | Pumping system, water, installation |
| 238220 | Radiant floor heating equipment installation |
| 238220 | Refrigeration system (e.g., commercial, industrial, scientific) installation |
| 238220 | Sanitary ware installation |
| 238220 | Scrubber, air purification, installation |