8421.99.01.40
Parts of machinery and apparatus for filtering or purifying water
Classification path
- Centrifuges, including centrifugal dryers; filtering or purifying machinery and apparatus, for liquids or gases; parts thereof
- Parts
- Other
- Parts of machinery and apparatus for filtering or purifying water
Rates of duty
- General (MFN)
- Free
- Column 2Cuba, North Korea, Russia, Belarus
- 35%
- Unit of quantity
- kg
Related lines in heading 8421
- 8421.11.00.00Centrifuges, including centrifugal dryers / Cream separatorsFree
- 8421.12.00.00Centrifuges, including centrifugal dryers / Clothes-dryersFree
- 8421.19.00.00Centrifuges, including centrifugal dryers / Other1.3%
- 8421.21.00.00For filtering or purifying waterFree
- 8421.22.00.00For filtering or purifying beverages other than waterFree
- 8421.23.00.00Oil or fuel filters for internal combustion engines2.5%
- 8421.29.00.05Refrigerant recovery and recycling unitsFree
- 8421.29.00.15Filtering or purifying machinery and apparatus for liquids / Oil-separation equipmentFree
- 8421.29.00.40Hydraulic fluid power filters, rated at 1,000 kPa or greaterFree
- 8421.29.00.65Filtering or purifying machinery and apparatus for liquids / OtherFree
- 8421.31.00.00Intake air filters for internal combustion engines2.5%
- 8421.32.00.00Catalytic converters or particulate filters, whether or not combined, for purifying or filtering exhaust gases from internal combustion enginesFree
About heading 8421
Centrifuges, including centrifugal dryers; filtering or purifying machinery and apparatus, for liquids or gases; parts thereof
Heading 8421 covers centrifuges and centrifugal dryers, plus machinery that filters or purifies liquids or gases, and parts for that equipment. It splits first by machine type: centrifuges (8421.11 to 8421.19), liquid filters (8421.21 to 8421.29), gas filters (8421.31 to 8421.39), and parts (8421.91 and 8421.99). Most lines in the heading are free of duty, with the main exceptions being certain centrifuge and engine filter lines.
Full guide to heading 8421Products in this heading
- Cream separators used in dairies
- Centrifugal clothes-dryers
- Water filtration units for a building or process line
- Oil or fuel filters for internal combustion engines
- Intake air filters for engines
- Catalytic converters and particulate filters for engine exhaust
- Dust collection and air purification equipment
- Replacement filter parts for water purification machinery
Frequently asked questions
What is the HTS code for an engine intake air filter?
Intake air filters for internal combustion engines are classified under 8421.31.00.00. The general (MFN) rate for that line is 2.5%.
What is the duty on a water purifying filter?
Machinery for filtering or purifying water falls under 8421.21.00.00. The general (MFN) rate is Free.
How do I classify a replacement filter element for a water purification unit?
Parts of machinery for filtering or purifying water go under 8421.99.01.40. The general (MFN) rate for that line is Free, while other parts of heading 8421 machinery go under 8421.99.01.80, also Free.
Source: USITC Harmonized Tariff Schedule, retrieved October 21, 2026.