| 8421.21.00 | 00 | For filtering or purifying water | No. | Free | | 35% |
| 8421.22.00 | 00 | For filtering or purifying beverages other than water | No. | Free | | 35% |
| 8421.23.00 | 00 | Oil or fuel filters for internal combustion engines | X | 2.5% | Free (A,AU,B,BH, C,CA,CL,E,IL,J, JO,MA,MX,P, SG) | 35% |
| 8421.29.00 | | Other | | Free | | 35% |
| 8421.29.00 | 05 | Refrigerant recovery and recycling units | No. | | | |
| 8421.29.00 | 15 | Other: | | | | |
| 8421.29.00 | 15 | Oil-separation equipment | No. | | | |
| 8421.29.00 | 40 | Other: | | | | |
| 8421.29.00 | 40 | Hydraulic fluid power filters, rated at 1,000 kPa or greater | No. | | | |
| 8421.29.00 | 65 | Other | No. | | | |
| 8421.31.00 | 00 | Filtering or purifying machinery and apparatus for gases: | | | | |
| 8421.31.00 | 00 | Intake air filters for internal combustion engines | X | 2.5% | Free (A,AU,B,BH, C,CA,CL,E,IL,J, JO,MA,MX,P, SG) | 35% |
| 8421.39 | | Other: | | | | |
| 8421.39.40 | 00 | Catalytic converters | No. | Free | | 35% |
| 8421.39.80 | | Other | | Free | | 35% |
| 8421.39.80 | 05 | Dust collection and air purification equipment: | | | | |
| 8421.39.80 | 05 | For machine tools of headings 8456 through 8465, inclusive | X | | | |
| 8421.39.80 | 15 | Other | X | | | |
| 8421.39.80 | 20 | Other: | | | | |
| 8421.39.80 | 20 | Industrial gas cleaning equipment: | | | | |
| 8421.39.80 | 20 | Electrostatic precipitators | No. | | | |
| 8421.39.80 | 30 | Other | No. | | | |
| 8421.39.80 | 40 | Gas separation equipment | No. | | | |
| 8421.39.80 | 60 | Other: | | | | |
| 8421.39.80 | 60 | Pneumatic fluid power filters, rated at 550 kPa or greater | No. | | | |
Harmonized Tariff Schedule of the United States inquiry: 534
