Simple plumbing job but what’s missing? Photo enclosed.

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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One of these http://www.discountedheating.co.uk/shop/acatalog/mcalpine-rwm2-rubber-multifit-washer-1-5.html

 

It will be stuck inside the fitting, use a small screwdriver to ping it out.

 

Wow that was quick. Thank you so much, I am really indebted to you all. All now fitted with no leaks.
Out of interest should the rubber seal that ended up in the right angle be glued to the pipe?

 

No, not glued

 

Thank you again. This forum is so useful for people like me. Boy, how I love the internet. Just hope I don't need the experts here for a long while now.

 

There should also be a red hard pressure friction washer to "push" the rubber seal into the fitting. See page 28 of the following link http://www.mcalpineplumbing.com/media/cat/20.pdf

 

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