StacksVerified U.S. regulatory reference

49 CFR §230.43

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The steam gauge supply pipe shall have a siphon on it of ample capacity to prevent steam from entering the gauge. The supply pipe shall directly enter the boiler and be maintained steam tight. The supply pipe and its connections shall be cleaned each time the gauge is tested.