Washington offers a standalone "Medical Gas Plumber" endorsement, separate from the base Journeyman Plumber certification. What reference material is that exam open-book on?
Not quite. The answer is D: NFPA 99C only
Unlike the base journeyman exam, Washington's Medical Gas Plumber exam is open book, but narrowly: candidates may bring only the NFPA 99C gas and vacuum systems book. That reflects how tightly focused medical gas piping is compared with the general trade knowledge the base exam covers.
Reference: PSI / L&I PSI Candidate Information Bulletin — reference materials (Medical Gas Plumber exam reference material)
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