McDonnell & Miller FS7-4SJ Snap Switch 30067439-890 You must pair it with

You must pair it with an RA2000 operator (sensor/dial) to achieve automatic temperature control

preventing hazardous gas accumulation

Interchangeable Components: Allows for total customization of capacity and charge by selecting the appropriate Sporlan Q or BQ cartridge and power head

the 4549-004-120VAC model ensures consistent flow management and long-term durability in demanding environments requires a stable 120V power supply

the Model 3050 provides 37 in-lb of stall torque

McDonnell & Miller FS7-4SJ Snap Switch 30067439-890 You must pair it withThe 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