A drain that integrates a field sensor switch. Connected by means of a 4-meter cable and watertight quick plug to the Gulper IC pump, it controls its ignition as soon as water enters the drain. This system allows gray water to be evacuated without the need for a control to be operated before the shower or sink is used. Small size, durable materials, no maintenance or cleaning. Non-return valve included. Connections for 19 and 25 mm pipe.