The "20CI" refers to a 20 PSI Cut-In (close)

provided the valve coil uses a standard 18mm Form A DIN 43650 interface

it features a fixed 1/2" bore with a precision-machined 1/8" x 1/16" keyseat to ensure positive shaft engagement and eliminate slippage under high-torque conditions

Constructed with high-grade

suitable for driving large relay banks

Emerson Alco 047521 Solenoid Valve Els PW 17895 The "20CI" refers to aThe Emerson Alco 047521 Solenoid Valve (model 200RB5F4T) is a heavy duty, 2 way normally closed refrigeration valve engineered for precision liquid, discharge, or suction gas service. As a pilot operated solenoid valve, it utilizes a 1 2 inch flare (SAE) connection and features an integrated mounting stud for secure installation in high vibration environments. This refrigerant flow control body is rated for a nominal R22 capacity of 8. 2 tons and an