CFR › Title 46 › Part 153 › §153.40046 CFR §153.400Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Columnar gauge glasses must not be installed on a cargo containment system.(b)Flat sight glasses must meet § 38.10-20(h) of this chapter.