the Kit 36 IntelliDrains work just like a normal ‘click-clack’ waste; however, if the maximum safe depth of water is reached (circa 36cm) then patented technology within the unit triggers the plug to open, helping to avoid a flood. Once the tap is turned off, the IntelliDrain allows the bath to empty to approximately 26cm and then automatically reseals, allowing the bather to enjoy a deep soak. Perfect for hotel applications or homes with children.