Air valve - but not sure what it is?

I noticed an air valve...kinda looks like a QR-1 valve.
It is located under/behind the radiator, right near the downpipe on my 99 W900L/Detroit.

It has 3 green air lines running into it.
One large one and 2 smaller equal sized ones.
Anyone know what this is w/o a photo?

It was mounted to the frame behind the radiator once upon a time and I am not sure I could remount it all that easily
as I cannot get to the other side of the bolts/nuts.
I am not sure if wiring tie-ing this and the hoses is sufficient for DOT or not. I think so?

 

So whats the DOT rule on this valve....can it be wire tied in place or does it NEED to be bolted?

 

Well it is stamped QR-1.
It is fed with a really thick hose (1/2") and has 2 delivery (3/8") hoses.

I called KW and had them send me the one for my truck, from Bendix.
It arrived but doesnt look anything like the one I have. I do not know if the valve I have was replaced nor if it's
even correct. But the new valve isnt designed for a (1/2") supply and didnt have this "BAL" port on it??

The original in black, has the supply on the TOP where the new one has a BALANCE port.
This is weird. I went to two different shops today (since KW was closed) and no one has anything like this.

 

Thanks...I think I just figured this out...#229860 is exactly what I need.
I am not sure why KW told me this is what I need and supposed to have/use. It doesnt make sense.