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Thanks John D, afraid never got to learn how to add pics, will have to remedy. Your picture enclosure Drain Cock Type A Heavy Pattern is very similar to our set up. The drain cock is fitted to the end of the pipe run quite seperate and below and to one side of the radiator. The 4 sided nut is...

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...

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...