Explanatory notes
β¦ action of a piston or plunger driven within a cylinder, the inlet and outlet being regulated by valves. βSingle-actingβ β¦ utilise the thrust or suction of one end of the piston only; βdouble-actingβ types pump at both ends of the piston β¦ Subheadings 8413.11 and 8413.19 These subheadings cover only those pumps, of whatever type, which form, or have been β¦