StacksVerified U.S. regulatory reference

49 CFR §179.220-14

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Openings in the inner container and the outer shell must be reinforced in compliance with AAR Specifications for Tank Cars, appendix E (IBR, see § 171.7 of this subchapter). In determining the required reinforcement area for openings in the outer shell, t shall be one-fourth inch.