Any truck newer than 1997 it has one its the law
On the other hand I can't think of a 2500 dually. I'm drawing a big blank. Who makes them?
You pull the hose off the spout and there should have been a white plastic ball it is the law all passenger vehicles after 97 is supost to have a roll over valve.
I have never heard such a thing. There are plenty of 2500's running around with duals
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