It is a direct replacement part

the EC3 controller is stand-alone

Common failure points include terminal corrosion

and PA250A

Simplified Serviceability: Designed with a thermoplastic seat module and bronze cage that allow for rapid in-line repairs

Watts 0009836 Valve 328140-751 It is a direct replacementThe Watts 0009836 (Model LF263A) is a high performance lead free water pressure regulator designed for commercial, industrial, and residential applications requiring precise downstream pressure control. Featuring a 1 2 inch NPT threaded connection, this direct acting diaphragm regulator is engineered with a Lead Free copper silicon alloy body to comply with low lead safety regulations. It operates within an adjustable pressure range of 10 to 125 psi,