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However those valves are prone to cracking so if using on a car that's going to be driven a fair amount I'd go with a metal one instead, better design.
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There are some aftermarket ones available also that should work and cost less, check NAPA, RockAuto, etc.
Beware. There are several similar heater control valves but they have different valve ratios. H30-110 is the correct number stamped on the valve.
Just Google #3502346 for sources but make sure the above number is on the valve.