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So when I had this issue the air was pouring out from the bottom valve. I just pulled the snap ring out and put the one from the new valve on so I did not have to remove the entire thing. Its just the bottom spitter plastic part that cracks and starts leaking. I just took whatever valve I could get at the closest Napa when mine happened and put me on the side of the road, since I just used the plastic part on the bottom the crack pressure did not matter. I left the other internals inside.  

FYI the most used crack pressure is 4.0psi and should be the most readily available. The crack pressure is usually on a metal tag on it. 
From what I can see its a Bendix T-294868 which is a 4.0psi crack pressure. 4868