The O-ring seals the thermostat insert to the thermostat housing; without this sealing ring, nothing works :-) Fits all “new-style” thermostat housings—that is, those with four M6 screws on the cover—such as the 24V models (C30SE, C40SE) or the newer Cih motors, like the C24NE, C26NE, and C30NE in the Omega A and Senator B.
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