What does the 440Op specification represent

and FJVR valve bodies

Professional installation ensures that the dial aligns correctly with the internal potentiometer or switch shaft for reliable operation

Does the enclosure protect against water spray

Marley Engineered Products 5813-2001-000 Thermostat What does the 440Op specificationFor field technicians and contractors maintaining Q Mark or Berko heating units, the Marley Engineered Products 5813 2001 000 Thermostat serves as the direct OEM replacement for residential and commercial wall heaters. This mechanical snap action thermostat is engineered to handle line voltage applications without the need for additional relays or complex control boards. It features a single pole single throw (SPST) configuration, making it a rugged