The component with the lowest price in the E-11 WATER PUMP-PULSE GENERATOR schematic is the Washer Seal, 6mm.
Parts such as the E-11 Water Pump-pulse Generator: Imp,water Pump, Nut,cap,6mm, Seal Mechanical, Bolt,flange,6x80 are included in the Cx500tc 1982 (c) E-11 Water Pump-pulse Generator parts fiche.
The E-11 Water Pump-pulse Generator assembly is constructed from several parts from which the Generator,pulse is the most expensive.