NC, auto-drain solenoid valve. Can preset the open and close time in the special time. With hand test button. Install easy, small shape, high reliability. Design for use with air purifying, air station, water auto-supply and irrigation in general. Port Size: Female G 1/4" or 1/2" Max valve pressure: 16 bar Body material: Brass Seal ring material: NBR Max Media Temperature: 80℃ Open time:0.5-10 secs Close time: 0.5-45 mins Voltage available: DC 12V; DC 24V; 12V/50; 24V/50; 11OV/50; 220/230/240V/50