Best shut-off valve for weep?

[slash007]

Finally had a chance to work on switching out some of the lines yesterday. Here is a sample of what I found:

 

[Randy]

This is a prime example of why they don’t recommend using galvanized steel pipe in a car wash system, much less in any plumbing system. The only steel fittngs we use are on the hose ends. That looks like it could be part or most of your problem.