Homeownership

This is what I'm working on today. This is under my kitchen sink, and it is leaking just enough to bug me.

So this is taken from laying on my back under the sink looking up. The round thing on the left is actually on the cold side.


And here's a close up of the thing that is actually leaking. It does not seem to be connected to anything, and I tried to turn the wingnuts by hand (righty-tighty) and it's pretty tight.

So now what?