49 CFR 195.420 : Transportation (§ 1.1 To Parts 1581-1699) — (§ 178.1 To § 199.245) — Other Regulations Relating To Transportation (Continued) (§ 178.1 To § 199.245) — Pipeline And Hazardous Materials Safety Administration, Department Of Transportation (Continued) (§ 178.1 To § 199.245) — Pipeline Safety (Parts 186-189 To § 199.245) — Transportation Of Hazardous Liquids By Pipeline (§ 195.0 To Appendix C To Part 195) — Operation And Maintenance (§ 195.400 To § 195.452) — Valve maintenance.