The lowest price component in this Eop-2 parts-list fiche is the Washer Seal, 6mm.
Some items from this specific schematic: Gasket Sheet Kit, (nas), O-ring., Washer,plug,drain 12, Washer O-ring Kit.
The Eop-2 assembly is constructed from several parts from which the Gasket Sheet Kit, (nas) is the most expensive.