McDonnell & Miller 343500 Bellows Assembly R-410A 65" WC set point and

65" WC set point and a Single Pole Single Throw (SPST) configuration

and environmental contaminants

Key Benefits System Protection: Minimizes pressure spikes to prevent the relief valve from nuisance tripping

If the switch shows no continuity and the burner is cool

reducing noise and improving heat transfer efficiency

McDonnell & Miller 343500 Bellows Assembly R-410A 65" WC set point andWhen you are servicing a 64 Series low water cut off, the McDonnell & Miller 343500 Bellows Assembly (Model SA64 2) is the standard issue component required to restore essential boiler safety functions. This authentic replacement bellows assembly is engineered for heavy duty steam boiler control, specifically bridging the gap between the internal float mechanism and the electrical switch. As a direct fit part for 64 Series LWCO and 764 models, it