I/M??
The breather valve/PCV is 7/16", the inlet on the intake is 1/2" and the hose provided is 5/8". The way it came was the hose connects into the stock breather hose, but it wasn’t releasing the pressure because that stock hose needs the same breather valve off the old airbox, but you can’t get it out without tearing the rubber around it. I don’t want to tear it as I will want to put it back to stock when I go to sell it.
If I wanted to do it legally, I’d either have to splice together two hoses to a connector and I have yet to find a connector that matches the sizes I need or buy another valve separately (which apparently you can’t do, but I’m looking into it). It’s just very complicated and this set up with the small filter (done by other 3 owners) works to release that pressure the easiest way.