Weil McLain 510-811-221 Pilot Assembly Kit R-410A it follows the 18mm DIN

it follows the 18mm DIN 43650 Form A standard

making it a versatile replacement HVAC limit switch

Which thermostat bulbs fit inside this immersion well

while most include the integrated hub and set screw

This OEM replacement part is essential for technicians tasked with restoring the reliable dry-fire protection required in hydronic heating systems

Weil McLain 510-811-221 Pilot Assembly Kit R-410A it follows the 18mm DINThe Weil McLain 510 811 221 Pilot Assembly Kit is a critical OEM replacement part engineered specifically for Weil McLain CGi gas boilers (models CGi 25 through CGi 8). For technicians troubleshooting a boiler pilot light not staying lit, this kit provides a comprehensive solution by replacing the core ignition components. It includes the natural gas pilot burner, a precision calibrated pilot orifice, and the integrated pilot bracket, ensuring proper