"Bass, Jerry" wrote:

When I tested the Thermostat in Hot water, the small stem protruded from the
outer end.  that pushes against the cap to force the copper valve over and
the small spring pushes on the brass washer to close the hole.  My view.

Jerry Bass

I agree. I think that is the way it works. In that case plugging
the bypass hole with a pipe plug and removing the thermostat should work.

Paul Lamar
 
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