The component with the lowest price in the AIR PUMP EXCEPT schematic is the Filter, Air Pump.
The Air Pump Except assembly is constructed from several parts from which the Pump Assy.,air is the most expensive.
A sample from the products for the Air Pump Except include: O-ring,5.8x1.9, Hose Assy.b,air, Filter, Air Pump, Hose Comp.