This internal rebuild kit is essential for preventative maintenance schedules in commercial refrigeration systems

Methane (CH4) calibration gas at a specific concentration (usually 50% LEL) is required to zero and span the E3SRMM catalytic bead sensor during routine inspections

It is footprint compatible with many existing 50 amp contactor setups

Its durable construction is intended to withstand the high-cycle demands of residential heating applications

McDonnell & Miller 101A Water Feeder R-410A This internal rebuild kit isFor service professionals managing residential or light commercial low pressure steam systems, the McDonnell & Miller 101A (Part Number 169400) remains a staple for automated level control. This 120Vac electric water feeder is specifically engineered for cold water feed applications, eliminating the need for manual monitoring and adding water to the boiler. Designed with a heavy duty solenoid, this unit handles a 150 PSI maximum water supply pressure