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    correct size allen key for tightening square recessed valve

    we have a central heating system which is 15-20 years old. At the end of the pipework feeding many of the radiators is a partially recessed square nut below which is a spout which I guess is for bleeding the pipework. Some of these square nuts periodically work loose and need to be tightened...
  2. E

    twyford double syphonic WC

    About 3 years ago we had the large blue plastic fitment replaced with a new one, and since then it has worked well. Please note I am pretty hopeless on understanding how mechanical things work, not something I am proud of but appreciate simply stated replies. I guess the blue apparatus is the...
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