... , auto-drain solenoid valve for air compressor. Can preset the open and close ... shape, high reliability. Design for use withair compressor, air purifying, air station, water auto-supply and irrigation in ... general. Motion2/2 way , direct action, Normally ClosedPort Sizefemale 1/4,3 ... :(ON)0.5~10secondsCertificateISO9001/2008 air compressor solenoid valve