581 SERIES VALVE SIZE 1, 5/2 WAY, SINGLE SOLENOID, SPRING RETURN EL, 1 PILOT VALVE 30MM CNOMO WITH FLOW CONTROLS, INTERNAL WITHOUT COIL PILOT VALVE WITH SINGLE/DOUBLE SOLENOID, LOCKING/NON-LOCKING MANUAL OVERRIDE. V581-I1-5/2SR-NONE-CNO-AL-INT-T1-117105