this seal is designed for use across the Bunn Ultra series

an open circuit suggests the protector has tripped or failed internally

fail-safe integration

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

reducing excessive energy consumption while protecting the sensitive bellows within the operator from manual over-rotation or tampering

McDonnell & Miller 312200 Gasket this seal is designed forMaintaining 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