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post #18 of (permalink) Old 05-02-2019, 07:02 AM Thread Starter
bruce1976spider
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Join Date: Aug 2016
Location: Chardon, Ohio
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Here's a couple of measurements - the 40mm screw-in style, and a later model drop in thermostat. I happen to have both...
The tops of the threads on the brass screw-in are just a bit under 39mm, and the diameter of the drop in is about 54mm

The 45mm thermostat is still in place - a 45mm socket arrives today.
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