The unit features a standard 1/2-inch NPT inlet and out connection

and the necessary connectors for a direct-to-board interface

Is this a solder or flare connection TXV

While surface debris can sometimes be cleared with a soft brush

This OEM coil is commonly found in York

Resideo L4008E1156 Control 320819-301 The unit features a standardThe Resideo L4008E1156 is a professional grade, remote bulb immersion type temperature control engineered for high limit safety applications in hydronic boilers and storage tanks. This high limit aquastat features a manual reset mechanism, ensuring that the system shuts down safely if temperatures exceed the 250 degree factory stop. Built for reliability, this controller uses a micro switch snap acting switch with a single pole, single throw (SPST)