49 C.F.R. § 179.103-2
Manway cover
(a) The manway cover must be an approved design.
(b) If no valves or measuring and sampling devices are mounted on manway cover, no protective housing is required.
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(a) The manway cover must be an approved design.
(b) If no valves or measuring and sampling devices are mounted on manway cover, no protective housing is required.