Hello
I am going to get a water to air intercooler. I have looking the mini madness one and I am looking what is that on the picture.

This is look like the mini madness one. Does anybody know what this bolt is?


Here is the pic of madness one. If you look on the pic that has that bolt too. Why?

 

Just a guess, but could that be where you add water? Why don't you give Madness a call and ask...then post the answer here so we all know!