I really couldn't figure out how to title this, but I'll be replacing the AOS on my car this weekend, and at the same time I'll be cleaning out the throttle body, intake runners, and some of the vacuum lines. When I had everything apart last time, I mistakenly removed the brown and white valve (I am assuming it's a check valve) that attaches to the vacuum lines beneath the intake runners. Can anyone tell me which direction this valve should be installed, and if it's important enough to replace while I'm doing the AOS? It's a small unit, with what looks like a 1/8" inlet and outlet, and is half brown and half white. I'll try to snap some photos if no one can figure out my description before the weekend arrives. Thanks for the help everyone.
