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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.

Thanks. Is it a wabco 1200 system saver??  Looks like there are a couple different ones. I’m going to have to take the tag tire off to get to it