StacksVerified U.S. regulatory reference

46 CFR §169.737

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Each hand portable fire extinguisher must be marked with a number, and the location where it is stowed must be marked with a corresponding number. The marks must be at least 1/2 inch high. Where only one type and size of hand portable fire extinguisher is carried, the numbering may be omitted.