Producer gas or water gas generators — HTS 8405
Producer gas or water gas generators, with or without their purifiers; acetylene gas generators and similar water process gas generators, with or without their purifiers; parts thereof
Chapter 84 › Heading 8405
2026 HTS Rev 19 Synced Rules verified Operational
Written to help non-specialists understand this page. Rates, dates, and legal facts come from the official records above and on the linked source.
HTS heading 8405 is a broad product category for equipment that generates certain industrial gases. It covers producer-gas generators and water-gas generators, whether or not they include gas purifiers, as well as acetylene gas generators and similar water-process gas generators. It also includes parts of those machines. The heading is about the gas-generating equipment and qualifying parts, not every machine that happens to use or store gas.
To reach the correct 8-digit HTSUS code, first determine whether the shipment is a complete generator or a part, then identify the generator’s operating type and principal function. The lower-level provisions may distinguish products by the kind of gas-generating process or equipment involved and, for parts, whether the item is identifiable for use solely or principally with covered generators. Confirm the exact wording of the current 8-digit subheading and any applicable legal notes; material alone is not necessarily the deciding factor.
What to check
- Identify the machine’s gas-generating process and the gas it is designed to produce; do not classify it only by its fuel, material, or end use.
- Decide whether the shipment is a complete generator, a generator supplied with a purifier, a separate purifier, or a replacement part; review how the tariff describes each item.
- For a part, document whether it is designed solely or principally for a heading 8405 generator and verify that it is not more specifically covered elsewhere.
- Use technical specifications, drawings, product literature, and the manufacturer’s description to match the article to the exact 8-digit wording.
- Check the current HTSUS, including section and chapter notes and any relevant classification rulings; ask a customs broker or seek a binding ruling if the product could fit more than one provision.
HTS heading 8405 summary
Producer gas or water gas generators is a 4-digit product category containing 2 published product-code lines in this snapshot. A heading does not carry one universal duty rate; classification must be narrowed to the line matching the product facts.
How to find your code in this category
A heading is a product category. To get the exact duty, narrow from this 4-digit heading to a sub-category (usually by material), then open the 8-digit code that matches your product.
Open any code in the tables below to see its exact duty rate, a duty calculator (enter your shipment value → estimated duty and landed cost), the rate-change history chart, and the country-by-country breakdown (including Section 301/232 add-on duties).
Why you have to click in: a single category can contain products with very different duties. The rate depends on the specific product — its material and construction — and on the country of origin, and those only get pinned down at the 8-digit code level. That is why this page points you to codes instead of showing one rate for the whole category.
Product codes & duty rates
👇 Each row is a specific product code — click a blue code to open its full page with exact duty rates by country, the rate-history chart, and a duty calculator. 👉
| Code | Description | General (MFN) | Special | Column 2 |
|---|---|---|---|---|
| 8405.10.00.00 👉 | Producer gas or water gas generators, with or without their purifiers; acetylene gas generators and similar water process gas generators, with or without their purifiers | Free | — | 45% |
| 8405.90.00.00 👉 | Parts | Free | — | 45% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 8405?
Producer gas or water gas generators, with or without their purifiers; acetylene gas generators and similar water process gas generators, with or without their purifiers; parts thereof. To classify a specific item you must pick the matching sub-category and 8-digit code above; the right choice usually depends on the material and construction of the product.
How do I choose the right code within this category?
Start from the sub-categories (typically divided by material—for example cotton versus man-made fibers), then open the active 8- or 10-digit code that matches the product. When unsure, a licensed customs broker or a CBP binding ruling can confirm the classification.
Reference information only, not customs, legal, or classification advice. Confirm the current code and rate against the official HTS before you import.