i change t-stats once a year with the water pump change, and i have found out it is wise to temp check them be for install. i drop them in a pot of boiling water and when they open, insert a piece of fishing line, let them cool and "clamp" the line. let the water cool to room temp and suspend the t-stats in the water( i tie them to a wooden spoon). start heating the water and note what temp they start to drop off. it is amazing sometimes at the difference. a laser thermometer is very helpful in the test...
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