[Land Yacht]

I went to Dollar Tree and for a buck got a 32 oz bottom of kids bubbles. I soaked everything on filter and lines to the tank really good and could not find any leaks. I said to myself, I may have to turn in my man-card if I don't find this :-) or at last my Guru card. However, I did find a leak on the regulator valve (or that is what I think it is - picture below). The leak is just to the left of the brass nut on what appears to be a joint. I can push around on it and stop the sound of the leak. Does that sound like it is cracked? Anyone have a part number?

What about instructions to replace?
Thanks Mike