requiring no minimum differential pressure

As a genuine York HVAC part

Does this kit include the solenoid coil or just internal parts

ensure you have these screws available for a secure fit

Functional Devices RIBU1SM-250 Switch 322838-752 requiring no minimum differential pressureThe Functional Devices RIBU1SM 250 is a specialized enclosed pilot relay featuring a Carling rocker switch for manual override control. This SPDT relay is engineered for industrial and commercial HVACR applications where local ON AUTO OFF manual override is required for troubleshooting or maintenance. The unit is housed in a NEMA 1 rated enclosure, pre wired with 16 inch leads to streamline field installation into any standard 1 2 inch conduit