ARO Solenoid Air Control Valve: Alpha, Four-Way / Two-Position, 1/4 in Female NPT, 10-32 Female NPT. Solenoid Air Control Valve. Flow Rate – Maximum. Solenoid Coil Not Included. Coefficient of Volume (Cv). Operating Pressure – Maximum. Operating Temperature – Minimum. Operating Temperature – Maximum. Compressed Air; Inert Gas. Inlet Port Connection Size. Inlet Port Connection Type. Pilot Port Connection Type. Pilot Port Connection Gender. Inlet Port Connection Gender. Pilot Port Connection Size. Exhaust Port Connection Gender. Exhaust Port Connection Size. Exhaust Port Connection Type. USA (subject to change).