following new heading: 9902.21.43 1,1,3,3-Tetramethyldisiloxane (CAS No. 3277–26–7) (provided for in subheading 2931.90.90) 1.1% No change No change On or before 12/31/2024 . 4338. Dimethylchlorosilane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.44 Chloro(dimethyl)silicon (CAS No. 1066–35–9) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2024 . 4339. Dichloromethylsilane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.45 Dichloromethylsilane (CAS No. 75–54–7) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2024 . 4340. Tris(TFP)-methylcyclo-trisiloxane DR Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.46 2,4,6-Trimethyl-2,4,6-tris(3,3,3-trifluoropropyl)-1,3,5,2,4,6-trioxatrisilinane (CAS No. 2374–14–3) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2024 . 4341. Tetravinyltetramethylcyclo­tetra­siloxane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.47 2,4,6,8-Tetrakis(ethenyl)-2,4,6,8-tetramethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane (CAS No. 2554–06–5) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2024 . 4342. Divinyltetramethyldisiloxane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.48 Ethenyl-[ethenyl(dimethyl)silyl]oxy-dimethylsilane (CAS No. 2627–95–4) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2024 . 4343. Input for plant protection agent Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.49 Cyclopropanol, 2-(butyldimethylsilyl)-1-methyl-, 1-metanasulfonate (CAS No. 1446996–86–6) (provided for in subheading 2931.90.90) Free No change No change On or before