mhhhh, excuse me sir, have you tried to purge your old compressor. If your compressor has a tank, usually the tank have a little drain valve in the bottom. you may leave aproximately 20 pound of air in the tank, and then you may open that valve, the condensed water start to exit the tank, and for cleaning you may fill the tank about 5 minutes with this valve open. Then you close the valve and then fill your compressor. This "clening procedure" may be performed usually, cause the water contained in the tank limits the life of your compressor.
Other advice is to buy a water trap, it may be