new heading: 9902.29.30 Threaded vent caps of nonmalleable cast iron designed for residential fuel oil tanks (provided for in subheading 7307.11.00) Free No change No change On or before 12/31/2025 . 11911. Cast iron nonmalleable threaded bushings for residential fuel oil tanks Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.29.31 Threaded bushings of nonmalleable cast iron to be installed to a residential fuel oil tank opening (provided for in subheading 7307.11.00) Free No change No change On or before 12/31/2025 . 11912. Cast iron nonmalleable threaded tank adapters for residential fuel oil tanks Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.29.32 Threaded tank adapters of nonmalleable cast iron designed for residential fuel oil tanks (provided for in subheading 7307.11.00) Free No change No change On or before 12/31/2025 . 11913. Cast iron nonmalleable threaded fill alarm main body for residential fuel oil tanks Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.29.33 Fittings of nonmalleable cast iron, each comprising the main body of a fill alarm designed for residential fuel oil tanks (provided for in subheading 7307.11.00) Free No change No change On or before 12/31/2025 . 11914. Cast iron nonmalleable threaded fill box caps for residential fuel oil tanks Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.29.34 Threaded fill box caps of nonmalleable cast iron designed for residential fuel oil tanks (provided for in subheading 7307.11.00) Free No change No change On or before 12/31/2025 . 11915. Cast iron nonmalleable threaded leg flanges for residential fuel oil tanks Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.29.35 Threaded leg flanges of nonmalleable cast iron designed for residential fuel oil tanks (provided for in