When servicing specialized boiler sight glass assemblies

The unit features automatic thermal overload protection to prevent winding failure and utilizes a 1/2-inch flatted shaft on both ends to accommodate dual-blower wheel configurations

The assembly includes the spring

The Cleveland Controls AFS-442 is a professional-grade air pressure sensing switch designed for critical monitoring in HVAC and energy management systems

Lochinvar & A.O. Smith 100208242 On/Off Switch 323055-751 When servicing specialized boiler sightThe Lochinvar & A. O. Smith 100208242 On Off Switch is a critical OEM replacement power switch engineered for high efficiency hydronic and water heating systems. As a veteran grade HVAC control component, this rocker style switch features a clearly defined "I O" symbol for definitive status verification during boiler troubleshooting and routine HVAC maintenance. Designed for 120V circuits, it serves as the primary manual disconnect on the control