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The A-4000-635 is specifically engineered for 1/2 inch NPT connections
it is the direct Carrier furnace flame sensor replacement for equipment utilizing the 41-409 hot surface ignitor
For easy field integration
ensuring exact electrical and physical fitment for Lennox-branded equipment
Mcdonnell & Miller G-3-SS Probe Rod The A-4000-635 is specifically engineeredFor industrial level sensing applications, the McDonnell & Miller G 3 SS Probe Rod (Part Number 179157) is a high grade 316 stainless steel component designed for precision and durability. Measuring 36 inches in length with a standard 1 4" diameter, this conductance type level sensor probe provides a reliable electrical path for detecting water levels in high pressure steam and hot water boiler systems. The G 3 SS is a non teflon coated rod, ensuring