Of all the components used in this assembly the Gasket Kit B (nas) is the most expensive.
Some items from this specific schematic: Washer,plug,drain 12, O-ring,23x2.4, Gasket,acg Cover (nas), O-ring,12.5x2.4.
This GASKET KIT B assembly utilises five O-ring,12.1x1.9(s) - the highest specified component.