[Gnawrocki1]

it looks like mine on coach 500, and that was a wabco 1200.  There should be a nameplate on it.  You should be able to take it out with 3 bolts in the land line bay and a few air lines.  They are also rebuildable depending on what is wrong with the rest of the unit if you like.

I was leaking out of the same place and decided to buy a new one complete.  There are many knock offs that I have not heard people complain about, but I found a new old stock on ebay for just a little more.