McDonnell & Miller 344300 Shield Assembly 30067439-890 it ensures consistent performance and

it ensures consistent performance and system reliability in residential and light commercial equipment

What causes a pressure switch like the 203933 to trip

Superior Durability: Constructed with self-cleaning contacts to prevent resistance buildup and intermittent "open circuit" failures

This kit is designed specifically for 240VAC residential electric water heater circuits and should not be used in low-voltage or gas-controlled applications

McDonnell & Miller 344300 Shield Assembly 30067439-890 it ensures consistent performance andThe McDonnell & Miller 344300 Shield Assembly, recognized as Model SA69 104, is a critical replacement component engineered for the 69 Series Low Water Cut Off (LWCO). Designed specifically for steam boiler applications, this assembly provides a protective surround for the float, safeguarding internal mechanisms against scale buildup and turbulent water conditions that could lead to nuisance tripping. For technicians servicing float type controls,