the primary shut off valve to feed cold water from the water meter to the whole house or the shutoff valve supplying the hot water heater only???
if its either one, I would insist on whomever changed it out at the same time with the hot water heater to come back and repair the problem they created.
First though, besure the valve is opened to the full open position. if partially opened, could be the cause for the squealing . post back with your findings and eventual solution. LJ
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