I just purchase the easystreet air suspension and i have seen a few org members with water trap between the the compresser and the tank. I know that i have to cut the line but what are the fitting that i would need or if any can tell me where to buy the water trap and the fitting that they use and  I also want to say thanks to Nate he's being helping out with some question that i have
 
 
the water trap goes between the compressor and the pressure switch.  basically you have your compress, the steel line goes into a fitting, then the water trap, out ot the pressure switch and then to the tank.  i got mine from home depot for like 25 bucks and they have all the fittings there, just get the trap, open it up and start trying pieces in.  thats what i did.