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Pressure switches are safety devices calibrated to specific inches of water column
while designed for Barber Colman and Schneider Electric systems (like the AM-111 crank arm)
or an oversized burner orifice
it typically does not require a vent line to the atmosphere
Honeywell 14004406-910 Thermostat Cover Pressure switches are safety devicesThe Honeywell 14004406 910 serves as a direct replacement component for various commercial pneumatic thermostats, providing a ruggedized interface for sensitive environmental controls. Engineered for versatility, this cover supports both vertical and horizontal mounting orientations, making it a critical stock item for retrofitting older pneumatic systems. The unit features built in temperature scale inserts calibrated for a 60 90 degree Fahrenheit