The hole does not match the thermostat (with rubber edging) and needs to be modified (as mentioned in other questions/comments). Using a 3 inch fan grinder provided the necessary ease for installing the thermostat. Unfortunately, this seems to be the rule rather than the exception for many details these days. I'm tired of getting parts that don't fit all the time. fits and ends up taking 1-2 hours of my time to get the job done.
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