; and (IV) the components of the vessel listed in paragraph (4) are manufactured in the United States; and (B) with respect to the 6th calendar year following the calendar year in which this subsection is enacted, and each calendar year thereafter, if the vessel meets the requirements of subparagraph (A)(ii). (4) Components The components of a vessel listed in this paragraph are the following: (A) Air circuit breakers. (B) Welded shipboard anchor and mooring chain. (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, propulsion motors, reduction gears, and propellers. (G) Shipboard cranes. (H) Spreaders for shipboard cranes. (I) Rotating electrical equipment, including electrical alternators and motors. (J) Compressors, pumps, and heat exchangers used in managing and re-liquefying boil-off gas from liquefied natural gas. (5) Waiver authority The Commission may waive the requirement under clause (i)(II)(bb) or (ii)(IV), as applicable, of paragraph (3)(A) with respect to a component of a vessel if the Maritime Administrator determines that— (A) application of the requirement would— (i) result in an increase of 25 percent or more in the cost of the component of the vessel; or (ii) cause unreasonable delays to be incurred in building or retrofitting the vessel