McDonnell & Miller FS7-4SJ Snap Switch Refrigerant ensuring robust flame monitoring and

ensuring robust flame monitoring and preventing hazardous gas accumulation

this unit is IP66/IP67 rated for superior moisture protection in high-humidity environments

providing reliable supplemental or emergency heat

Can this be used for a heat pump with auxiliary heat

Featuring a 10’ flexible probe

McDonnell & Miller FS7-4SJ Snap Switch Refrigerant ensuring robust flame monitoring andThe McDonnell & Miller FS7 4SJ (Part Number 120171) is a rugged, industrial grade liquid flow switch designed for high pressure applications where standard brass units fall short. This SPDT snap switch features a durable stainless steel body and wetted parts, allowing it to withstand a maximum pressure of 1000 PSI. Built with a 1 1 4" BSPT connection, it is engineered for precise flow sensing in large pipe systems across hydronic heating, industrial