[lawdogg149]

Diagram above is great for explaining.

first the tee is used to combine the green hose and the blue one from the valley pan. The blue hose on the manifold its self is blocked off with the cap. So now the green hose and blue hose go to one side of the catch can. The other side of the can has a short hose and filter on the end. This is used for allowing the system to breath. Could be hooked back into the intake manifold or intake piping if wanted too. No harm if done that way.