; (B) the vessel is documented under the laws of the United States; (C) all major components of the hull or superstructure of the vessel are manufactured (including all manufacturing processes from the initial melting stage through the application of coatings for iron or steel products) in the United States; and (D) the components of the vessel listed in paragraph (3) are manufactured in the United States. (3) Components The components of a vessel listed in this paragraph are the following components: (A) Air circuit breakers. (B) Welded shipboard anchor and mooring chain with a diameter of four inches or less. (C) Powered and non-powered valves in Federal Supply Classes 4810 and 4820 used in piping. (D) Machine tools in the Federal Supply Classes for metal-working machinery numbered 3405, 3408, 3410 through 3419, 3426, 3433, 3438, 3441 through 3443, 3445, 3446, 3448, 3449, 3460, and 3461. (E) Auxiliary equipment for shipboard services, including pumps. (F) Propulsion equipment, including engines, reduction gears, and propellers. (G) Shipboard cranes. (H) Spreaders for shipboard cranes. (4) Waiver authority The Secretary of Energy may waive the requirement under paragraph (2)(D) with respect to a component of a vessel if the Maritime Administrator determines that— (A) application of the requirement would cause unreasonable costs or delays to be incurred in building the vessel