23RLSW Water line

[apspies]

So we took her first camping trip this past weekend, and on Sunday morning when I was packing up I saw water dripping from under the trailer. Examining further, it appeared that it was coming from this area but It does not appear that the fittings or the pipe is bad. Then it started pouring out of this open line. When I turned city water off, it stopped. Does anyone know where this line goes and why it might be streaming water? It appears to be coming from behind the kitchen sink. I’m assuming that those two lines with the fittings are cold water inlets for the kitchen sink and the water heater, but please correct me if I’m wrong. Those are the only two items that draw water on that side of the trailer

 

[Jagiven]

I'm wondering if it is not a low point drain. Go inside the camper, right above that spot, I suspect you will find a pipe, with what looks like a Tee handle. Push down on it, and you will close the valve. If I am wrong you will, find what is connected to.

 

[apspies]

Low point drains on the other side. I looked under the kitchen sink and only found two lines leading in, one went to the cold tap on the sink and the other went somewhere else under the counter. I did not see this third pipe entering due to an installed panel under the shelf in the cabinet