8413.91.90 - Other

This HTS category, 8413.91.90, encompasses "Other" parts for pumps. It specifically includes components for pumps that do not fall under the more narrowly defined categories of parts for fuel-injection pumps for compression-ignition engines (8413.91.10.00) or parts for stock pumps used in papermaking machinery (8413.91.20.00). Therefore, this classification is a residual category for pump parts not otherwise specified.

The distinction from its sibling categories lies in the specific function and intended application of the pump. While 8413.91.10.00 focuses exclusively on parts for fuel-injection pumps crucial for diesel engines, and 8413.91.20.00 targets components for specialized stock pumps, this category captures a much broader range of pump parts. This can include various components such as impellers, seals, housings, shafts, bearings, and other structural or functional elements for a wide array of pump types not specifically addressed elsewhere.

The subcategories within 8413.91.90.90 further refine these "other" pump parts. Notably, it includes parts for hydraulic fluid power pumps, indicating a specific focus on components designed for systems that use pressurized fluid to generate power. Additionally, it contains a further residual category, 8413.91.90.96, which acts as a final catch-all for any pump parts that do not fit into the preceding more specific subdivisions within the "parts of pumps" chapter.