46 C.F.R. § 45.141
Manholes and flush scuttles.
Cite as 46 C.F.R. § 45.141 (2026)
Manholes and flush scuttles in position 1 or 2 or within any superstructure other than an enclosed superstructure must have permanently attached covers, unless the cover is secured by closely spaced bolts around its entire perimeter.