7307.19.90.40 - Grooved-end fittings (including grooved couplings)

This HTS classification, 7307.19.90.40, specifically designates grooved-end fittings and couplings made of iron or steel that are cast. These fittings are characterized by the presence of grooves designed to accept a gasket or sealing mechanism for joining pipes, typically in plumbing or fire sprinkler systems. The "cast" designation is crucial, indicating that these fittings are produced through a process of pouring molten metal into a mold.

This category is distinguished from its sibling categories by the manufacturing process. While other fittings within the "cast" parent category might be welded, forged, or otherwise fabricated, 7307.19.90.40 exclusively covers those produced by casting. Furthermore, the "Other" designations at subsequent levels imply that these grooved-end fittings are not specifically enumerated under more granular subheadings, making them fall into the general residual category for cast iron or steel fittings not otherwise specified.

As this is a leaf node, there are no further subcategories to introduce. Therefore, the practical application of this classification hinges on accurately identifying the physical characteristics of the fitting (i.e., grooved ends) and confirming its material (iron or steel) and manufacturing method (casting) through documentation or physical inspection. This ensures correct tariff application for these specific types of pipe fittings.