For outdoor applications exposed to elements

it meets rigorous industrial safety standards for gas and air applications

this part number refers specifically to the stem assembly

always check your specific unit serial number and parts list to confirm compatibility before installation

Utica-Dunkirk PB00903 Flame Sensor THPU32HP7Y For outdoor applications exposed toThe Utica Dunkirk PB00903 Flame Sensor is a specialized mercury flame sensor engineered for precision flame monitoring in cycling pilot ignition systems. As an E type mercury sensor with a bulb style #19, this component is essential for detecting the presence of a pilot flame and allowing the main gas valve to energize. The 48 inch capillary length provides sufficient reach for various HVAC burner box configurations, making it a versatile OEM