Standard International Trade Classification
U.S. exports of Parts for Producer Gas, Water Gas, and Acetylene Gas Generators (SITC 74172) 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 dataReplacement and spare parts for producer gas, water gas, and acetylene gas generators — including purifier components, reaction vessel parts, and associated fittings — serve a narrow but technically demanding segment of the industrial gases and chemical processing industries. Because the parent equipment operates under pressure and with flammable or toxic gases, parts must meet stringent material and dimensional specifications, and importers should document the specific generator model and application in entry paperwork to support classification. The relatively low trade volume of this heading means classification disputes, while infrequent, can be consequential for specialized industrial importers.
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14 import shipments a month
Purifiers that are integral to and specifically designed for producer or water gas generators generally classify as parts under this heading. Stand-alone industrial filtration or purification units that are not dedicated to gas generators may classify under separate SITC headings for filtering or purifying machinery. The design specificity and commercial documentation linking the purifier to the generator are the determining factors.
Importers should provide a commercial invoice that identifies the specific generator model, the part's function within the generator, and the material composition (particularly for pressure-bearing components). If the part is a pressure vessel component, documentation demonstrating compliance with applicable ASME or equivalent standards may be requested by customs or required for downstream installation approval.
Basic heading 74172 · $979K of $76.2B
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Exports · August 2026
destination
Mexico and Canada together take 62% of it.
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
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.
Through August 2026 · exports 10 of 12 months reported. Source: U.S. Census Bureau.