marlin jack: I do not want to start an argument, but the Flowcooler thermostat arrived with the "skirt" installed, it was exactly the correct dimension to match the orifice (I measured it), and I also tested the extension by heating the thermostat in a pot of water on a stove and the extension was correct. The gentleman can take his choice of the advice given here, but I wanted to set the record straight. I have no connection to Flowcooler other then being a satisfied customer using a number of these units in 351 Cleveland's. Just my experience, noting more or less.
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