7307.19.30.40 - Grooved-end fittings (including grooved couplings)

This HTS category, 7307.19.30.40, specifically covers grooved-end fittings and grooved couplings made of iron or steel. These fittings are designed for use in piping systems where the ends of the pipes are prepared with grooves to accept a specific type of coupling mechanism for joining. This category encompasses a variety of fittings used to connect, divert, or terminate grooved pipes, including elbows, tees, reducers, and couplings themselves, all characterized by their grooved end preparation.

While the parent category "Ductile fittings" broadly refers to fittings made of ductile iron, this specific subcategory differentiates itself by focusing on the *method of connection* rather than the material composition of the entire fitting. The "grooved-end" aspect is the defining characteristic here, indicating a specialized system of joining pipes that relies on mechanical seals within a grooved housing. It's important to note that while many grooved fittings might be made of ductile iron, this classification is based on the design feature (grooved end) that facilitates assembly within a particular piping system.

As this is a leaf node in the HTS classification, there are no further subcategories under 7307.19.30.40. Therefore, classification at this level is definitive for grooved-end fittings and couplings of iron or steel that do not fall into any more specific preceding categories. When classifying, focus on the presence of the characteristic groove designed for mechanical joint assembly and confirm that the fitting is indeed made of iron or steel.