The articles in question are described as a manual oil lubrication pump, item number 0402A1001-00, and an electric lubrication pump, item number 0402A1007-01. You indicate that both pumps designed to pump out a specific volume in cubic centimeters of lubricant per shot, or cycle at a specific pressure. The pumps are used to lubricate injection molding machines. A sample of the manual pump was submitted.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/I89207