The water level is rising too high when the cistern refills after flushing so the excess overflows into the outside pipe.
Under the old system I could adjust the ballcock arm which I think was copper but the modern cistern has plastic components
There is a white plastic arm then a red joint below it and the blue ballcock screws into the red joint.
How do I adjust the ballcock so that the water stops coming in before it reaches the height of the overflow pipe. :?:
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