The component with the lowest price in the THERMOSTAT schematic is the Bolt,flange,sh,6x25.
Some items from this specific schematic: Bolt,flange,nshf,, Wash,special,12mm, O-ring,30mm, Gasket,thermo Cas.
With a quantity of two pieces, the Bolt,flange,nshf, is the most used part in the THERMOSTAT diagram.