US lawFederal (United States)RegulationsTitle 46 CFR — ShippingChapter I — COAST GUARD, DEPARTMENT OF HOMELAND SECURITYPart 179 — SUBDIVISION, DAMAGE STABILITY, AND WATERTIGHT INTEGRITYSubpart C — Watertight Integrity Requirements179.34046 C.F.R. § 179.340Trunks.Last amended: 2016Year: 2026Length: 38 wordsOfficial source Cite as 46 C.F.R. § 179.340 (2026)Where a trunk ( i.e. , an enclosed passageway through a deck or bulkhead) is installed, it must comply with the requirements of § 179.360(a)(1) and with the requirements of § 171.113 in subchapter S of this chapter.Cross-references to the CFR171.113179.360Previous46 C.F.R. § 179.330Next46 C.F.R. § 179.350