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

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Key Benefits Precise Air Sampling: Calibrated for duct smoke detection in systems with high-velocity airflow

Successful installation requires a manometer to verify the outlet pressure at the manifold and typically involves setting the regulator adjustment screw flush before the final natural gas to propane conversion calibration

Industrial Build: High-impact construction designed for the rigorous demands of commercial food service

Weil McLain 591-391-862 Wiring Harness Els PW 17895 This unit features 1-1/8 inchThe 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