Sorry if this has already been discussed.

I have a leak under my kitchen sink.  It is at one of the rings.  It is a slow leak.  I can just barely feel the water.  However the ring moves freely.  What do I do?

If I can't fix it, and I have to call someone, I'd at least like to know what they are telling me is accurate.  Thanks.

Okay, Solar, it is those things that have the lines down them, that are not marked with any names.  the little rings with lines on the pipes.  I did try to tighten it with my fingers, but it just seemed to move up and down, and not get any tighter?  Is that normal?  

Eidt:

Okay, I tightened what I THOUGHT was the leak.  But, it wasn't. 

It is up by the very top.  It is leaking out of the bottom of the little ring (sorry, don't know the name) with the lines.  But, that ring is tight.  Or at least it appears to be. I can't manually tighten it.  Do, I do the cleaner?

A picture would be extremely helpful if possible. If you want, you can email me one and I can post it.

That being said, are the pipes plastic or metal?

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Well then that's good news that it isn't the water supply.
Most likely you can use drain cleaner, because it sounds like you have standing water in the pee trap,( the U shaped thing).
I would suggest you get a bucket and place it under the trap and unscrew it from both ends and take it out, about a cup of water will drain out, or more depending on how much water is backed up in the other drain line from the other sink. I assume it is a double sink.
Anyway, once you get it off, make sure there is no blockage, if it looks clean, then the problem is further down the line.
However, once you've cleaned it up, put it back together, you may use some silicone spray if available, or a tiny bit of Vaseline on the threads, just to help it go together smoother. It will also allow the threads to tighten a bit more and act as a seal against leaks.
After all of this is complete, the leak should have stopped.
If it hasn't, try the drain cleaner, so as to clear any left over blockage down the line.
You can do this a couple of times a year in all of your drains as a preventative measure.
let me know if you need more info.

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You're welcome. Let me know if you find the problem.