Maxitrol uses color-coding or plating (like this one) to distinguish pressure ranges

This HVAC control relay is essential for maintaining the sequence of operation in air handlers and furnaces

or moisture buildup in the sensing lines

According to the manufacturer specifications

York S1-025-35355-001 Temp Control Maxitrol uses color-coding or platingThe York S1 025 35355 001 temperature control is a precision engineered single pole single throw (SPST) switch designed for critical thermal regulation within HVAC systems. As an OEM replacement part, this component ensures seamless mechanical and electrical integration, maintaining the rigorous performance standards required for modern climate control units. The switch is calibrated with a fixed 40F Open and 30F Close logic, providing reliable