The Bosch HVAC 5181652 Pilot Burner Assembly Q3451E V3 is a replacement ignition component designed to provide a stable pilot flame for compatible gas-fired heating equipment. It delivers a controlled gas flow to the pilot burner, creating the flame required to ignite and sustain the main burner safely. Commonly used in Bosch furnaces, boilers, and other gas-fired HVAC systems, this a... https://www.partshnc.com/bosch-hvac-5181652-pilot-burner-assembly-q3451-e-v3