I do really love the look and feel of these. I'll try your suggestion. It did come with an extra ring. Haven't checked it out. I may even try doubling them up. I'll report back tomorrow once I've had time to play around with it a bit.hey guys there are Atty's that are of different sizes, from what I know the pyrex Oring situation was corrected and if your using one of the bigger 510 Atty's you will need a bigger Oring like AlimightyGod is stating. Mine fit perfectly on the Atty's I'm running but I do have a few other Atty's that it fits a bit more loosely on. Try a Danko # 47 ORings available at Home Depot CaseAce, they may work better on your Atty's or look over at the Home Depot they sell a bumch of these Danko ORings that will work for your specific Atty's, hope that helps ya out, these pyrex drip tips are dam good I really like these Tip's