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Ok thanks. That makes sense now.

So it stays closed until 65PSI or it limits it's output to 65PSI? I thought it was a limiting valve to keep the pressure lower than @120.

What pressure does this valve reduce too?

You big truck Guys are awesome. Thanks.

Do you know the part number for the top middle smaller valve? And where to get one?

The one I have looks like the top Middle Picture. The one I just ordered for a spare looks like the bottom picture. So I will need to plug two of the holes. The exit and one of the top holes. I like my little one. Thanks.

My valve is smaller. Is that one in your picture the MBI KN31000 from the sticky? I couldn't get the picture to in large so I could see it better. Do you plug the out and one of the exits to use the KN31000 since there is only one line out of the valve on the truck?

Thanks for the info simp. My valve is smaller and a different design but it must do the same job. According to the TM the other line I removed had to supply the CTIS but it was not specifically labeled in the TM. The TM only shows a CTIS diagram with that line coming off the wet tank along...

On the front of tank there is a pressure sensor for the CTIS on one side. In the middle is a pressure regulating valve. On the other side is the CTIS supply to the valve in the cab. They are all connected to the Wet Tank by a quad fitting. What does the middle pressure regulating valve and line...