This cover is proprietary to the Johnson Controls T-4000 series

Whether you are installing new remote bulb controllers or performing maintenance on existing sensor wells

Common Questions: Can I use the 90-291Q to replace a DPST relay

What manifold pressure should I set after installing this spring

Robertshaw 41-404 Hot Surface Ignitor This cover is proprietary toThe Robertshaw 41 404 Hot Surface Ignitor is a service ready, high purity recrystallized silicon carbide furnace ignitor engineered for rapid thermal response in residential and light commercial heating applications. This Norton 271M replacement features a Style C ceramic block and is factory rated to reach HSL ignition temperatures within 17 seconds at 120V AC. Designed for maximum conductivity, the unit includes 18 gauge nickel chrome lead wires