StacksVerified U.S. regulatory reference

49 CFR §230.52

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
All water glasses shall be equipped with no more than two valves capable of isolating the water glass from the boiler. They shall also be equipped with a drain valve capable of evacuating the glass when it is so isolated.