Sourcing U-tube manometers from China

Duty and classification for U-tube manometers

Heading 9026 covers instruments measuring or checking pressure and other variables of liquids or gases. A conventional non-electronic U-tube manometer is a candidate for 9026 20 80 00. Separately supplied instrument parts require their own classification check. The electronic and spiral or metal diaphragm rows are comparisons, not alternative codes for an ordinary liquid-column instrument.

Read from the UK Trade Tariff on 28 October 2026, all selected lines carry 0% duty for goods from China, with no anti-dumping or countervailing duty and no suspension recorded. The pressure-instrument lines attach mercury import controls; the electronic and other non-electronic lines also list mercury export controls. Mercury-containing measuring devices face additional restrictions. Obtain the filling composition and ask your customs broker to confirm the import-control requirement for the actual shipment.

Confirm the commodity code using the measuring function, construction, filling liquid and whether the goods are complete instruments or parts. See the wider flow meters and pressure gauges guide for other products within this heading.

Specify the tube, filling liquid and scale

Specify a mercury-free filling liquid and obtain its composition rather than relying on its colour. Agree whether the instrument arrives filled or empty, the filling procedure, working orientation and storage arrangement. State the measured gas, pressure connections, differential range, allowable operating pressure and temperature, and compatibility of the tube, hoses and seals.

Agree the scale units, graduation spacing, reading method and acceptable error against a calibrated reference. Confirm whether the scale shows liquid height or converted pressure for the specified filling liquid. Include the mounting board, zero adjustment, hose fittings, spill protection and transport closures in the approved sample.

For a pressure-bearing assembly, confirm whether pressure equipment rules apply to its construction and intended service. Keep the proposed application and operating limits with the specification and arrange testing and certification checks where needed.

Worked duty example

Illustrative example, not a quote: Illustrative order of 800 mercury-free U-tube manometers under 9026 20 80 00, invoiced at £3,500 free on board, with £800 of freight and insurance to the UK. The customs value is £4,300. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £4,300, so it is £860. 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

Tube and mounting: check for cracks, scratches, distorted bends, loose clips and a scale that moves relative to the tube.

Liquid and zero: match the filling liquid to the agreed composition; check for bubbles, contamination and consistent zero adjustment in the specified orientation.

Readings: compare rising and falling differential pressure with a calibrated reference across the agreed range, using the specified liquid and reading method.

Connections and packing: check hose fit, sealing, transport closures and protection around the bend. Record leakage, readings and damage during inspection.

What goes wrong

Changing the filling liquid without changing a pressure-calibrated scale can produce incorrect readings. Bubbles, contamination, tilted mounting and reading the wrong part of the meniscus also affect results. Approve the liquid and reading instructions together, then use the same arrangement for sample and shipment checks.

Loose hose joints can cause drifting readings, while poor packing leaves the bend vulnerable to breakage. An empty tube also leaves the intended filling unresolved. Ask the supplier to identify the intended liquid and refer any proposed mercury-filled version to the Environment Agency before ordering.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For components and parts, see sourcing for manufacturers.