Schneider Electric (Barber Colman) TK-4001 Temp Control Els PW 17895 What is the difference between

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It serves as an essential watchdog for the combustion process

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This assembly features a stainless steel ball and stem to resist scaling and corrosion

Schneider Electric (Barber Colman) TK-4001 Temp Control Els PW 17895 What is the difference betweenThe Schneider Electric (Barber Colman) TK 4001 is a high performance pneumatic bulb thermostat designed for proportional temperature control on reheat systems, return air terminal units, and sampling chambers. Engineered for heating applications, this direct acting controller features a 1 8" x 48" averaging bulb that ensures accurate thermal sensing across wide duct spans. With a factory set 15 psig supply air pressure and a 60 90F operating range,