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8402.90.00.90/Downcomer Pipe Section/Japan

Downcomer Pipe Section from Japan

Large-diameter pipe that circulates hot water from boiler drum to lower mud drum in water-tube steam boilers. Classified as HTS 8402.90.00.90 for its role in vapor generating systems.

Duty Rate — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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Import Tips

• Specify seamless construction and pressure ratings matching boiler design codes

• Pair with riser pipe diagrams to show complete circulation system context