8481.30.20.10 - Of iron

This HTS subheading specifically classifies check (nonreturn) valves constructed primarily of **iron**. These valves are designed to permit flow in only one direction and prevent backflow, commonly used in piping systems, tanks, and other containment vessels. The material composition is the defining characteristic for this classification.

This category is distinguished from its sibling, 8481.30.20.90, by its material. While both subheadings fall under "Check (nonreturn) valves: Of iron or steel," this specific node exclusively covers those made of iron. The sibling category, conversely, encompasses check valves made of steel. Therefore, precise material identification is crucial for correct classification.

As this is a leaf node, there are no further subdivisions within this specific classification. The focus remains on identifying check valves where iron is the primary constituent material. Examples include cast iron or malleable iron check valves used in various industrial fluid control applications.