With a quantity of two pieces, the Bolt,flange,6x22 is the most used part in the THERMOSTAT diagram.
The Thermostat assembly is constructed from several parts from which the Thermo Unit Assy is the most expensive.
Some items from this specific schematic: Thermostat Assy., Bolt,flange,6x22, O-ring,47.5x2, Cover,thermostat.