This natural gas valve is a direct OEM replacement for the Knight WH155 wall mount boiler

If the inducer fan is running but the switch fails to close at the 0

Optimized Airflow Management: Provides precise timing for fan motor activation and shut-off cycles to maintain indoor comfort

and ambient air monitoring

though upright installation is often recommended to minimize sediment accumulation in the core tube

Armstrong Fluid Technology 110108MF-397 Bearing Assembly 322057-301 This natural gas valve isThe Armstrong Fluid Technology 110108MF 397 Bearing Assembly is a high performance, all in one replacement kit designed specifically for Series S and H in line circulators. As a critical evolution in HVAC pump repair parts, this maintenance free bearing assembly (SBA) eliminates the need for manual oiling or periodic greasing, significantly reducing operational downtime. This genuine OEM pump replacement kit includes a 4. 5 inch centrifugal impeller,