King 42521 521 Wire And Valve Locating System King Innovation is proud to offer the latest in locating technology. Specifically designed for irrigation professionals, the King AL is an electrical tester for quickly and safely locating and identifying underground valves and wires. Trace wire paths, determine depth, and identify potential wire breaks, wire nicks, and solenoid valves when troubleshooting with the King AL. The King AL is a great everyday instrument for outdoor contractors who need a rugged, yet lightweight locating system.