I have taken apart the U bend to clear blocked hair and now something seems to be missing. If I connect the horizontal pipe to the right angle and do the thread up the two parts can still be pulled apart as there is nothing to stop the thread on the right from sliding off the pipe. What do I need to fix the problem as I have no plumbing skills. The strange thing is I haven't moved so it isn't as though I have walked off and dropped something.
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