Servicing doubles manifold

[MxDiver]

A set of old steel 72's were given to me last week, I had the visual and hydro done and they are fine, however the manifold has a leak.
It is a US Divers three piece manifold with a single outlet in the center and a J valve in one of the tanks.
Does anyone have, or can point me to, any servicing information on this manifold?
I don't know were the leak is, when I picked them up the guy who did the testing wasn't there. I'm planning on having them filled to about 1500 psi tomorrow to find the leak.

Thanks for moving the thread Larry.

[MxDiver]

I just got back from my LDS; the leak is where the center piece mates to one of the valves. There is no o-ring on this joint is a compression fitting. I already cleaned the surfaces with a polishing cotton wheel (but no polishing compound) in order to clean any dirt but it didn’t help. There aren’t any dings on the mating surfaces, any ideas?

[ScaredSilly]

You say a compression fitting I thought they are tappered threads which would mean teflon tape.

Hmm, not sure but this could mean the compression ring is done??? Can the nuts screw in far enough to make the compression ring seal??

[MxDiver]

You have to remember this from an "old" set of 72s, about 15+ years, they have a single valve in the middle, here is a picture of what they look like:

the center section is not the screw in tipe with double o-rings like the new ones.