The McDonnell & Miller 313900 is a high-performance valve bracket gasket engineered specifically for technical reliability in boiler water feeder systems

ensuring secure attachment to float balls or clevis joints

This sensor is specifically calibrated for compatibility with Intertherm

Whether you are performing a control board swap or a harness repair

Maxitrol R325E10-1022A Spring The McDonnell & Miller 313900The Maxitrol R325E10 1022A is a high performance red spring engineered specifically for technical field adjustments in 325 5 series gas regulators. Designed for professional HVACR gas pressure regulation, this spring allows technicians to modify the outlet pressure range to a precise 10" to 22" W. C. (Water Column). This specific range is critical for ensuring stable fuel delivery to commercial appliances and industrial burners that require higher