I know this has probably been covered before but I want to make my own option b tank for the ic. I understand every thing and how it works and I can find all the parts but have no clue where I can find the orpish not sure if I spelled that correct LOL. Is this some thing I can just pick up from the local auto store and what exactly am I looking for if I ask some one at the auto store.

 

What people have been using for an orifice is just a universal vacuum tee like the one pictured below. They are just cutting one side of it off and shoving it in the hose from the heat exchanger to tank, preferably on the side closest to the exchanger.

 

Ok that's what I thought thanks for clearing that up