I'm new to kegging, and purchased o-rings to rebuild poppets. I found it problematic with most of the designs. These work great. They don't have the retaining legs that the originals do, so you have to be careful when you reassemble the post, but that's not a big deal. I know I will be buying more, because in the long run it will be so easy to replace an o-ring.
Reviewed by: Bret