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I found a major air leak coming out the center hole with a pin in it.  This device is on the bottom of what I believe to be my "wet" tank.  I believe this must be a auto drain.  It is made by Bendix and has the number 450 on it. 

Is my guess correct? Is it rebuild-able?  Or should I just replace it?

Thanks for all the help,  Art

Does it look kinda like a square about 4" on each side?  If so, it is probably an auto drain.  Yes, there is a rebuild kit Bendix part 282134.  I have two of these on my bus.

Federal law requires a tank with an auto drain also have a manual drain.  I haven't had another look at my tanks to see where an auto drain might be.

Brian,
   Coming out the bottom of this tank I have a manual valve on one side and the auto drain on the other.  The auto drain has a pin in the middle of the four inch square and is embossed with "push pin to drain manually".

I guess we are all going to benefit from you going to Bendix school.  Thank you for sharing.

            Art

Eagles have used the auto drains since the 70's  Art you can buy a kit for those but most of the time it just needs to be clean up a little also you can buy just the needle for$ 1.14  keep it they work  good and are simple to change valve needle

I happen to have these on my bus so I knew what they are.  I did look up the rebuild kit in the catalog I got from class.

I know BW doesn't like the automatic drains, but they are really a very simple design.  They should spit out air basically once for every compressor cycle.