We have a slow leak from the pipes in our airing cupboard. I can see where the water is coming from but I don't know what the object is. In the image attached you can see the top of a vertical pipe terminating in a chamber with a plastic screw cap on the top. The water is coming from under the cap. The vertical pipe branches from a horizontal pipe coming from part way up the hot water tank.
I'm assuming that the chamber and screw cap have some function other than to block the pipe. Should I just try to screw the cap down harder or is the leak a sign of something more serious going on in the system?
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