How to: dux ballcock repair.Overflowing toilet cistern? A simple dux ballcock repair job will fix this in no time. Today I'll show you, how to repair your ballcock in 10 minutes, without the need of a plumber. First, you need to turn off your water supply.
For your toilet this is usually to the side or below your cistern/watertank. Check water is off Take the lid off your cistern. Push down on the arm of the ballcock to make sure water has been correctly turned off.
If water is still flowing, you may need to turn your water off at the main shut off valve. Click on back button to return.
Unscrew the float (anticlockwise) Shake it and listen for water sloshing around.If you hear water sloshing in the float, replace it. If the float is good.....Take hold of large nut on ballcock and undo (anticlockwise) The arm and washer holder will pull away from valve.
Undo the washer retaining nut and replace washer. 
Once you have replaced the washer do up the retaining nut. Guide ballcock arm and washer into valve. Hold the large nut, slightly back when pushing washer back into valve. Twist ballcock arm back and forth till its guideing lug slips into correct position. Now tighten large nut. Fantastic: your almost there. Turn the water back on and set water level in cistern. To lower water level, bend the ballcock arm downwards. To raise water level, bend the ballcock arm upwards. Flush the cistern and check all is well. Your dux ballcock repair is complete.
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