McDonnell & Miller 61 Low Water Cut Off R-410A Most failures result from moisture

Most failures result from moisture exposure in the blower compartment or electrical surges originating from the transformer

and light oil with a high flow capacity of 3

This kit is a direct replacement for McDonnell & Miller 347100 and includes the necessary O-ring (Tetraseal) to ensure a gas-tight

This design ensures low pressure drop across the 3/8-inch ports even during peak demand

McDonnell & Miller 61 Low Water Cut Off R-410A Most failures result from moistureThe McDonnell & Miller 61 Low Water Cut Off (Part Number 140100) is a heavy duty mechanical control designed for residential steam boiler applications. Engineered for systems with a 20 PSI maximum steam pressure, this float operated safety device prevents catastrophic boiler failure by interrupting the electrical circuit if the water level drops below the safe operating line. The unit features 1" NPT connections for a secure fit into the water column