Anti-dumping Duties (AD) Anti-dumping duties are a type of product duties assessed by U.S. Customs. Learn More What are Anti-dumping and Countervailing Duties? Related articles Managing a return Where Does Flexport Ship? How Do I Create a Reserve Storage Inbound? Pricing - Fulfillment Fees for SKUs Report How do I Manually Place Flexport Fast-Tags In My Shopify Website Theme?