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Hot water heating system has a Taco circulator that always hums 24/7 - even when the Thermostat is turned all the way down and system is not running. Only stops humming if I turn the power off.

Being lazy and have a bad shut off - I want to replace what looks like an old Fluidmaster 400 - with a bad float - but the base (part attached is grey and not the newer black & it is thinner in diameter - so not sure what too do - if I run all the water I can lower water pressure enought to...