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HSChapter 84
U.S. exports of parts for producer gas, water gas, and acetylene gas generators (HS 840590) totaled $1.1M in July 2026.
Importers of Parts for Producer Gas, Water Gas, and Acetylene Gas Generators paid $16K in duties in July 2026 — an effective duty rate of 10% on $164K in dutiable value, based on actual customs collections rather than the published tariff schedule. Parts for Producer Gas, Water Gas, and Acetylene Gas Generators imports of $164K in July 2026 ran 38% below the year-to-date monthly average of $264K.
Last updated: July 2026 dataSouth Korea and India are the leading US suppliers of parts for producer gas, water gas, and acetylene gas generators, with France and Italy also contributing meaningfully to import flows. All replacement and service parts for these generators enter under a single tariff line, 8405900000, so classification hinges on demonstrating that the component is specifically designed for gas-generating equipment of heading 8405 rather than a generic industrial fitting. Given the hazardous-gas service environment of these generators, importers should also verify that replacement parts meet applicable ASME or ANSI pressure-equipment standards.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
21 shipments/mo
If a carbide hopper or purifier is imported as a standalone unit not presented with the generator, it may be classifiable as a separate apparatus under its own heading. However, when imported as a clearly identified replacement part for a specific acetylene generator model, it is properly classified under 8405900000 as a part. Presenting the original equipment manufacturer's part number and a letter of intent referencing the parent machine strengthens the classification position.
As of current schedules, no broad antidumping or countervailing duty orders specifically target gas generator parts from South Korea or India. However, importers should verify the current status with a licensed customs broker, as trade-remedy orders can be initiated or modified. South Korea is a US free-trade-agreement partner under KORUS, which may provide preferential duty treatment for qualifying originating goods.
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Subheading 2 of 2 in heading 8405
Subheading 840590 · $164K of $1.9M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8405900000 | Pts,Prod Gas,Wtr Gas,Acetylene Gas,Wtr Pro Gas Gen | $164K | 10.00% | 100.00% | $16K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8405900000 | Parts Prod,Wtr,Acetyl Gas,SIM Wtr Process Gas Gen | $1.1M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$164KYoY · Pro
Exports
$1.1MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Canada and Australia together take 75% of it.
customs district
origin
entry
rate provision · imports
the effective duty rate is 10.00%.