Sensus 143-16-511-09 Valve Assembly Els PW 17895 it acts as a normally
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Sensus 143 16 511 09 Valve Assembly Els PW 17895 it acts as a normally it acts as a normally open switch that closes only when the draft inducer motor provides sufficient suction through the integrated 1 4" barb connection When you are troubleshooting a unit heater that is tripping on high limit