US lawFederal (United States)RegulationsTitle 46 CFR — ShippingChapter I — COAST GUARD, DEPARTMENT OF HOMELAND SECURITYPart 64 — MARINE PORTABLE TANKS AND CARGO HANDLING SYSTEMSSubpart B — Standards for an MPT64.3946 C.F.R. § 64.39Valve securing device.Last amended: 2016Year: 2026Length: 14 wordsOfficial source Cite as 46 C.F.R. § 64.39 (2026)Each filling and discharge valve must have a securing device to prevent unintentional opening.Previous46 C.F.R. § 64.37Next46 C.F.R. § 64.41