Bill, I have to confess that I need to convert my BME Edge 30% to that system too. At first I had the Hayes stuff without the piece of brass tubing in the middle and the clunk would go to the front of the tank when I turned the tank upside down (every time). So I used the Tygon for the first 4 flights. Now I need to go back and put the black stuff back in (and do it right this time).