The McDonnell & Miller G-4-SS Probe Rod (Part Number 179158) is a high-grade 316 stainless steel grounding electrode engineered for demanding liquid level control applications in steam and hot water boiler systems

It is also found in brands like Broan

this switch is the primary defense against heat exchanger damage and hazardous overheating

What causes these igniters to fail prematurely

Raypak 002663B Ignition Wire The McDonnell & Miller G-4-SSWhen troubleshooting a Raypak IID (Intermittent Ignition Device) system that is cycling or failing to fire, the Raypak 002663B Ignition Wire is a critical checkpoint for any service technician. This high tension ignition wire is engineered to deliver the concentrated voltage required from the ignition control module to the pilot igniter, ensuring a clean and immediate spark. Standard wires often fail due to the high heat environment of the burner