DC Master Plumber with Gas (304) The DC Master Plumber with Gas (304) combines two regulated trades into one credential? most jurisdictions separate plumbing and gas work entirely. You’ll field questions on pressure regulation, vent termination, and gas line sizing alongside traditional water systems, demand specialized knowledge few competitors possess, and prove readiness for complex mixed-utility projects that command premium rates.
| Exam Name | DC Master Plumber with Gas |
| Exam Code | 304 |
| Format | PDF & Practice Test Engine |
| Target Year | 2026 Updated |
| Features | 100% Verified Q&As |
