Drilling hole in 180deg Thermostat...where?

Just inside the outer sealing diameter a few millimeters. Drill the hole under 1/8" and make sure you install it up.

Steve Best
 
I have a Shaw 180 thermostat and I did not have to drill anything.. what is a "blurp" hole....?????? I hope I did not mess up!
 
I've been using Robert Shaw 180 degree t-stats in both of my SC's for years without drilling holes and I have never had any cooling problems.
 
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