I saw an Angel AIR tank yesterday at my local shop and had to have it. I bought it and after reading the manual, and checking the website, I noticed that it says you can get rid of your secondary reg. I am running a '02 Cocker with a Rat valve and have been running the stock reg on it for the longest. I'm looking to get two questions answered. Is anyone running AIR as their only reg? With the Rat valve, what input pressure do you recommend? Thanks everyone.