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much bigger. At the end of the long section of the T is a multi turn 'turn thing' (sorry don't know what the technical term is). This seems to open and shut the flow of water as you would expect so that when open the central heating system is short circuited- quite why you would want to do...

I have a leak in a t-valve which lies between the hot water out and the return pipe to the combi boiler. The leak is not serious just a constant drip whilst the heating is on and seems to be coming through a join in the casing in the end not connected to the pipes. Is there anything I can...