The York S1-5882873 is the official superseding part number

OEM Integrity: Built to withstand high-static pressure environments in residential and commercial air handlers

Can I use this switch for a unit requiring a different WC rating

As an OEM-approved refrigeration oil

a minimum opening pressure drop (typically around 2 psi) is required to lift the diaphragm and ensure full flow

Johnson Controls A19AAB-4 Temperature Control 30067439-890 The York S1-5882873 is theThe Johnson Controls A19AAB 4 is a professional grade mechanical temperature control designed for heavy duty HVACR applications requiring high precision single stage temperature control. This robust remote bulb thermostat features a single pole, single throw (SPST) switch configuration that is factory set to open on high temperature. Engineered with a liquid filled sensing element, the A19AAB 4 provides consistent repeat accuracy that remains