1, whether the tube inserted the Cabanatuan whether standard, some small sign of the tube is not standard. 2, the tank vacuum tubes empty adjustment to the central axis 3, whether the water tank jacket and liner eccentric, some small manufacturers of this product. Basically three reasons. In addition, if you unskilled, intubation, try to use a lubricant. First Lane Banpen cold water, add some detergent or laundry detergent, quite on it with the usual amount of washing two coats. And take the nozzle dip in the detergent water inside, be easily installed on the tank. The installation should be installed when the nozzle, then pull down installed the tailstock inside can.