8413.70.20.22 - With discharge outlet under 7.6 cm in diameter

This HTS category, 8413.70.20.22, specifically classifies centrifugal pumps that are single-stage, single-suction, and frame-mounted, with a critical distinguishing feature: their discharge outlet has a diameter under 7.6 cm. These pumps are designed for various liquid-moving applications where a smaller discharge diameter is required. Examples include certain types of fractional horsepower pumps used in domestic appliances, small industrial machinery, or specialized fluid transfer systems. The "frame-mounted" designation indicates that the pump is typically mounted on a baseplate or frame, often with a separate motor, facilitating installation and maintenance.

The primary differentiating factor for this subcategory lies in the size of the discharge outlet. It is crucial to distinguish this classification from its sibling, 8413.70.20.25, which covers identical pump types but with a discharge outlet measuring 7.6 cm or greater in diameter. Accurate measurement of the discharge port is therefore paramount for correct classification under these two codes.

As this HTS code represents a leaf node, there are no further subcategories to introduce. Classification concludes at this level, relying on the precise determination of the discharge outlet diameter. The scope is therefore limited to the specific parameters outlined: single-stage, single-suction, frame-mounted centrifugal pumps with a discharge outlet under 7.6 cm.