This mercury-free thermostat is a direct replacement for legacy models including the 1E56-444

and Pennco

Extended Reach: A 12" stainless steel probe allows for deep insertion into large plenums to measure the average air temperature effectively

The plastic duct mount enclosure includes an integrated mounting flange and a pre-installed foam pad to effectively dampen mechanical vibrations

Legacy Refrigerant Compatibility: Dedicated scales for R-12

York S1-025-22740-000 Pressure Control This mercury-free thermostat is aThe York S1 025 22740 000 Pressure Control is a critical high limit safety component designed for precise refrigerant management in commercial and residential HVAC systems. Engineered as a Single Pole Single Throw (SPST) switch, this OEM part is calibrated to open the electrical circuit at 325 PSI and automatically close at 225 PSI. This pressure regulation ensures that your compressor and high side components remain within safe operating parameters,