U.S. exports of Parts for Producer Gas, Water Gas, and Acetylene Gas Generators (HS 840590) totaled $979K in August 2026.
Importers of Parts for Producer Gas, Water Gas, and Acetylene Gas Generators paid $11K in duties in August 2026, an average duty rate of 10.05% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Parts for Producer Gas, Water Gas, and Acetylene Gas Generators imports of $112K in August 2026 ran 54% below the year-to-date monthly average of $245K.
Last updated: August 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.
14 import shipments a month
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.
Subheading 2 of 2 in heading 8405
Subheading 840590 · $979K of $6.4M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8405900000 | Pts, Prod Gas, Wtr Gas, Acetylene Gas, Wtr Pro Gas Gen | $112K | 10.05% | 100.00% | $11K |
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 | $979K |
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.
Trade Directory
List your company under HS 840590 — Parts for Producer Gas, Water Gas, and Acetylene Gas Generators, so the companies trading it can find you. Be the first supplier listed.
Exports · August 2026
destination
Mexico and Canada together take 62% of it.
customs district
origin
entry
rate provision · imports
duty collected equals 10.05% of imports for consumption.
ImportsExports
Imports
$112KYoY · free account
Exports
$979KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $3.8M of Parts for Producer Gas, Water Gas, and Acetylene Gas Generators and exported $12.5M.
Through August 2026. Source: U.S. Census Bureau.