I made one with two glass bottles, about 15 ft of 1/4 in. ID tubing two black corks, water and food coloring. Take the two large mouth bottles doesn't matter what size and get two corks that fit tight. Drill two holes in each cork. Actually I burned them through, wife did not care too much for this!!
Fill bottles with about 1 inch of colored water. Cut three pieces of hose, two long and one short. Put one hose that runs to the bottom of each bottle this is the long one that attaches to the carbs. Run a second short hose that just enters the bottles. This connects the two bottles together. Make sure that there is not enough liquid to fill either bottle to the top. This will ensure that no liquid gets in the carbs.
Now all you have to do is hookup, grab some brew and figure out how to adjust without burning your hands. When the liquid is equal in both bottles your done.
