The moisture trap is the exact one that I use. I think that the air adjusting valve isn't the one you want, though--although it works great for air tools. If it's the one I'm thinking of, it is small, brass, has a guage on it, with a little thumbwheel about the size of a dime. If you look through it, it is just an air restricting valve. It won't keep the pressure on the low side constant--in other words, when you let go of the trigger on the airbrush, the pressure on the input to the airbrush will shoot up to tank pressure. When you press the trigger, the air will come out at high pressure, until that air in the hose is down to the valve's pressure. I've got one, and it works great for air tools, but not so well for airbrushes. The air takes too long to go down the right pressure with the small CFM that an airbrush uses.
I'd suggest doing one of two things: Take the valve back, get a real regulator (the MP5148 is probably the one to get), or take both back, and get an integrated air filter/regulator. You can get one at harbor freight for about $20 (which is the one I'm using currently on my airbrush--the other stuff is for the tools). However, I've thought that the C-H stuff is better built than the harbor freight one--I was just feeling cheap that day
. If I had to do it over again, I'd get the C-H stuff. The regulator is about $20, the moisture trap's about $10 IIRC. Oh, while you are there, get a couple of quick-disconnects, and some teflon tape. If you ever decide to get more airbrushes, or use the tank to fill your tires, they come in handy.
Hope that helps,
Dan