Robust construction designed to withstand repeated thermal cycling and manual strain on the control head

this seal is designed for use across the Bunn Ultra series

System Safety: Crucial for maintaining the air-fuel ratio by preventing unmetered air from entering the combustion chamber

making it a staple for HVAC service kits and boiler repair applications across residential and commercial heating systems

Durable Construction: Features high-grade insulation and a terminal connector designed for HVAC sensor troubleshooting and vibration resistance

McDonnell & Miller 312200 Gasket Robust construction designed to withstandMaintaining the integrity of boiler water feeders and liquid level controls requires high performance sealing components designed for steam and hydronic environments. The McDonnell & Miller 312200 Gasket is a critical replacement valve bracket gasket engineered specifically for Series 21, Series 25A, and Series 27 units, including the 27W model. As the direct updated version for 311100, this part ensures a precision fit for mechanical water feeder