the Secop Diversitech 195B0388 (NF11FX model) is the professional choice for reliability

Proper installation requires verifying step motor resistance and ensuring the controller signal matches the valve's port configuration to prevent operational faults

and BI3 series (15 PSI) and A5 series (75 PSI) F&T traps

Can I replace a 7-1/8" insertion switch with a shorter probe

and 6-inch valve bodies

Nordyne 632673 Pressure Switch 324846-701 the Secop Diversitech 195B0388 (NF11FXThe Nordyne 632673 Inducer Pressure Switch is a critical safety component designed for high efficiency forced air furnaces. As a genuine OEM replacement part, this single pole, single throw (SPST) switch is factory calibrated to a 1. 13 in. W. C. set point, ensuring the draft inducer motor establishes proper static pressure before the ignition sequence begins. This furnace air pressure switch prevents hazardous operation by monitoring the venting