Heavy-Duty Diesel Oxidation Catalyst (DOC) from United States
A flow-through catalytic converter that oxidizes CO and HC in heavy-duty diesel truck exhaust upstream of DPF/SCR systems. It falls under tariff item 8421.32.00 as catalytic apparatus for purifying exhaust gases from internal combustion engines.
Duty Rate — United States → Canada
0%
Import Tips
• Confirm the DOC is designed for diesel exhaust aftertreatment systems
• Declare it as a catalytic converter for exhaust gas purification
• Provide engine specifications and emissions compliance documentation to CBSA