Here is a inline oxygenator i threw together for a club member out of 3/8" tubing and 1" tube with KF flanges. This is meant to be mounted to his brew sculpture and connect with 3/8" ID vinyl hoses for wort and 1/4" oxygen line. The 3/8" tubing was silver soldered to the 1" tube and filed smooth on the inside to eliminate pockets that would cause sanitation problems. http://picasaweb.google.com/kevin.ladue/Oxygenator