Civic EG

What is up with the metal tube that goes into that box on the back of the block and up thru the intake manifold and into a pcv?How do i change it without breaking anything?And how about the rubber line from that box that leads into the back of the block?Is a pcv in the block there?This box i speak of is below the intake manifold.Two lines come out of it-a metal one that goes up through the intake,coming out in a pcv whose rubber line dumps into the intake manifold,and a rubber line that goes into the block just below intake.95 B18B1.HUH??!!?

Ok-i get it now (mostly) but i still feel like im going to break that pcv taking it out.also id like to get inside that box and clean it!