678_MO_S 678 ? Missouri (Springfield) Journeyman Gas Fitter Missouri’s 2023 plumbing and gas code updates now require journeymen to demonstrate proficiency with cross-linked polyethylene (PEX) piping systems and updated pressure-relief valve installation protocols. The 678 exam reflects these revisions, testing knowledge of modern materials alongside traditional cast iron and copper standards. Applicants unprepared for the refreshed content risk costly failures.
| Exam Name | 678_MO_S 678 ? Missouri (Springfield) Journeyman Gas Fitter |
| Format | PDF & Practice Test Engine |
| Target Year | 2026 Updated |
| Features | 100% Verified Q&As |
