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It is an inversion valve.
Part numbers would be
NSN 2530013835209
12422306 is another.. 50002, 50002B.
Found on ebay under the 124 #
Numbers do not cross to anything civilian that I had found so far.
Looks like a standard inversion valve that comes on a 939 truck as well. I can't read any of the numbers in the picture. The one on the far left is the load sensing valve like in the pictures below.