Complete unit with cabinet, sensor and solenoid valve for shutting off air to waste oil pump. When a level corresponding to 300 mm from full level has been reached, a warning light will come on and show "Order emptying". If this is not done when the level comes up to 150 mm from full level, a solenoid valve is activated which shuts off the supply of air. This is so that it will not be possible to overfill, which in turn can cause environmental damage, and costly clean-up measures. Supply cabinet 230V, max 10 amp, protection class IP 65.