Breather cap

Thog, I actually have mine hooked up like you have it, except the breather is on the passenger side to help hide away the hose to the air cleaner. And the PVC is on the drivers side with the rubber line running foward and under the return spring.

I like to hook them both up. The reason is to keep some air flowing out of the breather to help prevent any oil build up and cakeing up into crud in the valve cover and head surface of the passenger side.
Though the flow is a minamal amount due to the style air cleaner, unscilenced and open, it is still better than none IMO.

Theres nothing wrong with a open breather like 69signetv8 has pictured. I've run them like this for years without any problems. But the everyday stock type drivers get it hooked up.