acura21

I just bought this 95 accord ex with vtec and the intake has two holes on it I know the one that sticks out is the breather hook up but it also has another hole with a black rubber plug witha hole in it on it. also i was wondering what it is, ive looked all over for it but no luck. Also if anyone has pics of it hooked up on there accord like mine id like to see it so I can go off that to hook it up correctly because the tubes came undone and I want to get it put back correclty. also there are three metal lines that im confused with which one its which i think the top one is the breather and the 2nd one down goes into that rubber plug with the hole in it?