I recently replaced a water heater and at the same time I cut out all of the old copper and steel (or is it iron?) pipe and replaced it with CPVC. I relocated the water heater in the process to a more sensible place in the basement and have since plumbed everything in and tested the cpvc for leaks. The problem is, I have little to no water pressure on either of the above 2 floors. Is it possible I still have air trapped in the lines? I didn't think to open some faucets until after I'd already filled the 50 gal. tank. At that point, needless to say, there was already some serious air pressure built up in the lines. The faucets/showers just dribble water or cough/spit a mixture of air and water? Any help from the pro's would be greatly appreciated!