CFR /  Title 49  /  Part 179  /  Sec. 179.202-9 Top fittings protection.

The tank car tank must be equipped with top fittings protection conforming to AAR Specifications for Tank Cars, appendix E paragraph 10.2.1 (IBR, see Sec. 171.7 of this subchapter). [80 FR 26749, May 8, 2015]