I agree and from my tests with this my air pocket was along the circumference of the pipe and thats when I was really able to "tune" the siphon. This late at night is when I do my best DIY thinking but I cant convince my home depot to stay open 24hrs. Damn it!!CHOMPERS;556695; said:Tayloring would be a problem with my idea since once you drill the hole, you are committed. I think the air pocket would be a standard elongated heart shape or elongated balloon shape. Varying the flow will just elongate or shorten the airpocket. It will remain centered or along the circumference of the pipe. As long as you hit the air pocket at any location, I think the problem is solved.