What is this?! Part of my compressed air system on 1983 35FC

[compmanben]

Hi Folks,

I have recently replaced by Bendix AR-2 air dryer. While I was
working under the coach, I couldn't help but notice a part with an oil
leak. I'd like to do some work on it, but I don't know what it is!

It looks like it is part of my compressed air system. The lines go
out of sight and I can't easily trace them.

http://groups.yahoo.com/group/Wanderlodg...0/pic/list

I posted the pictures to a new "What is it?" album.

Thanks in advance for your help!

Nate Owens
1983 35FC
"It's a Wanderful Life"