Precision Dimensions: Features a 2-inch ID and 10

The ceramic insulator is built to withstand high dielectric stress and extreme temperatures without cracking

Incorporating high-grade materials for long-term durability

It is recommended to use a new high-temp silicone or fiberglass gasket during installation to maintain an airtight seal at the furnace collector box

Never bypass a vent safety switch in a permanent installation

Siemens Combustion QRA4M.U Scanner Els PW 17895 Precision Dimensions: Features a 2-inchThe Siemens Combustion QRA4M. U is a high sensitivity UV flame scanner engineered for the rigorous supervision of gas or oil flames and ignition spark proving in intermittent burner operations. As a veteran grade flame detector, this sensor utilizes a specialized UV sensitive cell with two electrodes designed to ignite upon detecting radiation within the 190 to 270 nm spectral range. This ignition triggers the necessary current in the flame detector