| Naics index | Naics index description |
|---|---|
| 238220 | Household oil storage tank installation |
| 238220 | HVAC (heating, ventilation and air-conditioning) contractors |
| 238220 | Hydronic heating system installation |
| 238220 | Industrial process piping installation |
| 238220 | Kitchen sink and hardware installation |
| 238220 | Lawn sprinkler system installation |
| 238220 | Mechanical contractors |
| 238220 | Natural gas piping installation |
| 238220 | Oil burner installation |
| 238220 | Pipe fitting contractors |