StacksVerified U.S. regulatory reference

46 CFR §109.333

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The master or person in charge shall insure that each fire main cutoff valve is open and sealed to prevent closing, except that a cutoff valve may be closed to protect the portion of the fire main system on an exposed deck from freezing.