This switch is a standard 1/4" flare high-pressure control

Enhanced Safety: The included gasket for gas regulators provides a secondary barrier against gas escapement at the adjustment point

provided the tube still spans at least 80% of the duct and the end cap is re-installed to seal the system

This unit features 1-1/8 inch ODF (Over Double Female) connections

Common Questions What does a 0

Weil McLain 591-391-862 Wiring Harness Els PW 17895 This switch is a standardThe Weil McLain 591 391 862 Wiring Harness is a critical OEM replacement part designed for standing pilot ignition systems in Weil McLain CG and CGa boilers. Engineered for hydronic heating service, this harness provides secondary electrical integrity between the gas valve, pilot, and control module, maintaining consistent boiler performance. In the field, a compromised harness is often the root cause of intermittent pilot ignition failure or erratic