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This rulemaking action amends the Hazardous Materials Regulations to revise certain requirements applicable to the manufacture, use, and requalification of DOT-specification cylinders. PHMSA is taking this action in response to petitions for rulemaking submitted by stakeholders and Agency review of the regulations for compressed gas cylinders. Specifically, this rulemaking incorporates by reference or updates the references to several Compressed Gas Association publications, amends the filling requirements for compressed and liquefied gases, expands the use of salvage cylinders, and revises and clarifies the manufacture and requalification requirements for cylinders.