Signal Mate 3-Probe Pump Out Level Controller 10-30 Volts AC or DC - 3POUTLOW29The 3 probe liquid level controller uses 2 probes that controls a single contact to energize or de energize a solenoid or relay coil. This pump out will keep a tank empty using the black and white probes. The probes are cut by the customer and the level will stay between the black and white probes opening and closing a single contact to energize a solenoid or relay coil. This is a 3 probe pump out using 10 30 Volts AC or DC for the electronics control