For S 25 KV - 25 ... - IL dispersing elements. Allows inline operation mode, see UTL 25.DK 25.11 is mounted around the dispersing element. The DK 25.11 must be at a lower elevation than the surface of the liquid during operation. With this operating mode, no air is drawn in as a result of turbulence in the vessel.The hoses used should have an inner diameter size of 13 mm (inlet) and 9 mm (outlet) respectively to fit the DK 25.11 flow chamber.