3926.90.45.90 - Other

This HTS category, 3926.90.45.90, encompasses "Other" gaskets, washers, and seals manufactured from plastics or other materials covered by headings 3901 to 3914. This classification is intended for those sealing components that do not fit into more specific subcategories within the broader "gaskets, washers and other seals" grouping. The key determinant for inclusion here is that the item functions as a seal and is made from the specified plastic materials, but lacks the distinct characteristics or form that would qualify it for a more granular classification.

Distinction from sibling categories is crucial. For instance, this category is distinct from HTS 3926.90.45.10, which specifically covers "O-Rings." While O-rings are a type of seal, their unique toroidal (ring) shape and function differentiate them, placing them in their own dedicated subcategory. Therefore, any plastic gasket, washer, or seal that does not possess the defining characteristics of an O-ring would fall under this "Other" classification.

As this is a terminal node in the HTS, there are no further subcategories to introduce. Classification within 3926.90.45.90 relies on a process of elimination. If an item is a plastic gasket, washer, or seal, and it does not meet the specific criteria for any other designated subcategory under "gaskets, washers and other seals" (such as O-rings), then it will be classified here. The emphasis is on its function as a seal and its composition, after more specific options have been ruled out.