Sourcing cast iron soil pipes from China
Cast iron soil pipes from China pay 0% UK duty, with the same rate across heading 7303 and no listed trade remedies. For sales in Great Britain, CE marking remains recognised for construction products. Specify the drainage standard, joint system and coatings before ordering. Cambridge China Bridge sources cast iron soil pipes.
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Duty and classification for soil pipes
Read from the UK Trade Tariff on 23 November 2026, heading 7303 covers tubes, pipes and hollow profiles of cast iron. Ordinary grey cast iron soil pipes for non-pressure drainage fall within 7303 00 90 90. The table includes adjacent ductile iron and pressure-pipe lines for classification comparison; these are not interchangeable soil-pipe specifications.
Every supplied line carries 0% duty for goods from China. The supplied tariff record lists no anti-dumping or countervailing duty, suspension, steel measure or import control. Import VAT is separate. Confirm with your customs broker whether and when these pipes fall within the UK carbon border adjustment mechanism. See the UK carbon border adjustment guide.
Confirm the material and whether the pipe is intended for a pressure system before declaring it. Cast iron fittings belong under heading 7307, so classify fittings separately. Use finding your commodity code and the wider cast iron pipe guide.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Grey cast iron soil pipes, not for pressure systems | 7303 00 90 90 | 0% | None |
| Other ductile iron pipes, coated rather than bare | 7303 00 90 10 | 0% | None |
| Other ductile iron pipes, without internal and external coating | 7303 00 90 20 | 0% | None |
| Other cast iron pressure pipes, for classification comparison | 7303 00 10 90 | 0% | None |
Specify the soil-pipe system and coatings
The site's existing pipe guide specifies BS EN 877 for cast iron soil and drainage pipes. State the standard edition in the purchase specification, together with nominal diameter, wall thickness, length, straightness, socketed or socketless ends, and internal and external coatings. Identify indoor or buried use and the wastewater conditions the coating is intended to withstand.
CE marking continues to be recognised for construction products sold in Great Britain. Before ordering, ask for the declaration of performance and supporting assessment documents for the exact pipe range. Compare the declared intended use with your project specification. Use testing and certification support to review the proposed evidence.
Approve an assembled sample using the intended couplings, seals and fittings. Record mating dimensions and coating details rather than relying on matching nominal diameters. Specify end protection, separators and lifting arrangements so pipes arrive without chipped ends or coating abrasion.
Worked duty example
Illustrative example, not a quote: Illustrative mixed batch of grey cast iron soil pipes for a drainage merchant under 7303 00 90 90, invoiced at £32,000 free on board, with £4,000 of freight and insurance to the UK. The customs value is £36,000. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £36,000, so it is £7,200. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.
Inspection checklist
Dimensions: measure bore, outside diameter, wall thickness and length against the approved drawing; check straightness and joint ends.
Castings: inspect for cracks, chipped sockets, casting defects and rough internal surfaces; compare suspect pieces with the approved sample.
Coatings and joints: check coverage, adhesion evidence and handling damage; assemble sample pipes with the intended seals and couplings and review leakage-test records.
Documents and packing: match markings and performance documents to the supplied range; check batch identification, end protection and bundle condition. See quality inspection explained.
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What goes wrong
Matching nominal diameters can conceal incompatible outside diameters or socket geometry. A pipe may fit the supplier's coupling but fail with the buyer's existing system. Approve the complete joint assembly before production and check it again on arrival.
Coatings can hide casting defects, while rubbing between pipes damages exposed surfaces during transport. Inspect representative pipes before packing and photograph bundle condition on arrival. Keep damaged or mismatched pieces separate while the supplier reviews the evidence.
Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.
Frequently asked questions
What is the UK import duty on cast iron soil pipes from China?
The supplied tariff record shows 0% duty across heading 7303, with no listed anti-dumping or countervailing duty. Ordinary non-pressure grey cast iron soil pipes fall within 7303 00 90 90.
Which standard should I specify for cast iron soil pipes?
Agree the edition, intended use, joint dimensions and coating specification before ordering.
Can CE-marked cast iron soil pipes be sold in Great Britain?
CE marking remains recognised for construction products in Great Britain. Ask for the exact range's performance documents and check the declared use against your project specification.
Are cast iron soil-pipe fittings covered by the same code?
Cast iron fittings belong under heading 7307. Classify fittings separately and check their dimensions with the pipes, seals and couplings you intend to use.