the 4-inch stainless steel probe is factory-sealed to maintain its environmental rating

this valve is factory-set at 150 PSI and 210°F to provide reliable overpressure and thermal protection

and KeepRite furnace models

95" WC rating signify

DriSteem 405725 Flame Sensor 320788-704 the 4-inch stainless steel probeThe DriSteem 405725 Flame Sensor is a critical OEM replacement part designed for precision flame monitoring in gas fired humidification systems, predominantly the DriSteem GTS and GTS DI series. As a veteran technician knows, maintaining a reliable DC microamp signal is essential for preventing nuisance burner lockouts. This sensor utilizes flame rectification technology to verify combustion, ensuring the gas valve remains energized only when a stable