Product classification
HS code for Flexible conduits: 8307.90
Tubing, flexible, with or without fittings of base metal, other than those of iron or steel.
Classification of flexible conduits under HS 8307.90
Flexible conduits made of base metals other than iron or steel are classified under HS code 8307.90. This heading covers flexible tubing of base metal, with or without their fittings. The classification depends primarily on the material of construction. While iron and steel variants are common, 8307.90 is the residual category for tubing made from aluminum, copper, brass, or other non-ferrous metals. These products are typically used for protecting electrical wiring or for the conveyance of fluids and gases where flexibility and vibration resistance are required. The construction often involves a spirally wound metal strip that allows for movement while maintaining structural integrity. Under the Harmonized System, if the conduit is combined with insulating material for electrical purposes, it might still fall here unless it is considered an "insulated fitting" under heading 8547. However, standard flexible metal conduits remain in 8307 regardless of their end-use in electrical or mechanical systems, provided they are not specifically designed as parts of other machinery.
- Covers
- Aluminum flexible conduits for wiring
- Brass flexible hoses for plumbing
- Copper flexible tubing for gas connections
- Flexible metal bellows made of non-ferrous alloys
- Liquid-tight flexible non-steel conduits
- Flexible metal exhaust connectors (non-steel)
- Also under 8307.90
- Mueller Streamline copper tubing
- Watts brass connector hoses
- Flexaust aluminum ducts
- Swagelok specialized metal hoses
- Danfoss flexible copper lines
Codes often confused with 8307.90
Common mistake. The most frequent misclassification is 8307.10, which is specifically for flexible tubing made of iron or steel. Users often fail to distinguish the base metal during declaration. Additionally, if the conduit is made of plastic, it must be classified under heading 3917. If the product is an insulated electrical cable rather than just the protective housing, it belongs in heading 8544. Furthermore, if the tubing is specifically designed for use as a part of a vehicle or aircraft, it might be misclassified in Chapter 87 or 88, though 8307 generally takes precedence as a heading of specific description.
Top exporters and importers of HS 830790 (the code used for flexible conduits), 2025
In 2025, the largest exporter of HS 830790 (the code used for flexible conduits) in UN Comtrade data was China, with 15% of world exports; the largest importer in UN Comtrade data was the United States, with 16% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 830790, not only flexible conduits.
Top exporters 2025 · share of world exports
- 1 China $68M 15% of world exports
- 2 Germany $52M 11% of world exports
- 3 United States $49M 11% of world exports
World total: $454M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $85M 16% of world imports
- 2 France $34M 6.6% of world imports
- 3 Germany $33M 6.3% of world imports
World total: $524M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for flexible conduits
Brazil classifies flexible conduits under NCM 8307.90.00: HS 8307.90 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about flexible conduits
What is the HS code for Flexible conduits?
The HS code for Flexible conduits is 830790 (Tubing; flexible, with or without fittings of base metal, other than those of iron or steel). Flexible conduits made of base metals other than iron or steel are classified under HS code 8307.90.
How do I classify Flexible conduits for customs?
Flexible conduits is classified under HS code 830790 — Tubing; flexible, with or without fittings of base metal, other than those of iron or steel. This is a 6-digit subheading level code.
Are fittings included in this HS code?
Yes, HS code 8307.90 includes flexible tubing whether or not it is fitted with its own connection pieces or couplings.
Which countries are the top exporters of flexible conduits (HS 830790)?
In 2025, the top exporters of HS 830790 (the code used for flexible conduits) in UN Comtrade data were China ($68M, 15% of world exports), Germany ($52M) and the United States ($49M). World exports came to about $454M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of flexible conduits (HS 830790)?
In 2025, the top importers of HS 830790 (the code used for flexible conduits) in UN Comtrade data were the United States ($85M, 16% of world imports), France ($34M) and Germany ($33M). World imports came to about $524M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Flexible conduits the same in all countries?
The base HS code 830790 for Flexible conduits is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for flexible conduits in Brazil?
In Brazil, flexible conduits (HS 830790) is classified under NCM 8307.90.00.