So, I cannot find this part of the engine in the Shop Manual, so I have a few pics below to identify it. Basically, there is a rubber hose coming out of the top of each cylinder head (pic 1), going down to some junction thing at the base of the engine (pic 3). Contains oil - I know because it's leaking all over the place.

One hose is a straight shot, one is not a one-piece - it has a joiner/union in the middle (pic 2). Came this way, not sure if it's supposed to be that way. It is leaking out of this union, so I bought 3 feet of hose and a new union to replace.

Before I do, I wondered if you could tell me a) if the union is a problem (it did not always leak, but I've only had truck 3 weeks), and b) what the "junction" is at the bottom of the engine where they all meet.

Thanks, pics below...