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While both modules belong to the MEP500 series
the 667994403 features a robust frame and provides a direct fit for several legacy models
this auto-reset pressure switch features a 405 PSI cut-out and a 330 PSI cut-in
375"ID 2 13/16"
Siemens Building Technology 544-577-25 Sensor L99H008 While both modules belong toThe Siemens 544 577 25 Immersion Temperature Sensor is a high precision field device engineered for liquid medium sensing in hydronic and HVAC systems. Built around a Pt 1000 Ohm RTD element (Platinum 375 coefficient), this sensor provides highly accurate resistance to temperature conversion across a wide range from 0F to 250F ( 18C to 121C). This unit features a 2. 5 inch probe length and comes complete with a low profile thermowell, ensuring
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