Had the main line rust through so I am replacing the whole thing. Needless to say the whole thing is a rusty mess. I can't get the nut off the box valve at the front. It is the one the has a line come in the top and then another out of the side that runs to the back. I was gonna just clip the line off and replace the box. I can't figure out how to get it off of the bracket though. No bolt or nut on bottom just a flat piece.

Any advice?

 

I know this is a couple weeks old but usually sprays the nut that goes into the box real good helps. I did that same line on my dakota and i sprayed every nut with pb blaster. the one on the box i used vice grips to break loose.