US lawWashingtonRegulationsTitle 296 — LABOR AND INDUSTRIES, DEPARTMENT OFChapter 296-150V — CONVERSION VENDOR UNITS AND MEDICAL UNITS296-150V-1430WAC 296-150V-1430WAC 296-150V-1430. What requirements apply to gas piping system openings?Last amended: 1999Year: 2026Length: 18 wordsOfficial source All openings in the gas piping system must be closed gas-tight with threaded pipe plugs or pipe caps.PreviousWAC 296-150V-1420NextWAC 296-150V-1440