The component with the lowest price in the WATER PUMP - PULSE GENERATOR schematic is the Washer Seal, 6mm.
Some items from this specific schematic: Bolt,flange,6x80, Bolt,flange,8x95, Bolt,flange,6x22, Nut,cap,6mm.
With a quantity of six pieces, the Bolt,flange,6x25 is the most used part in the WATER PUMP - PULSE GENERATOR diagram.