as some other customers have mentioned, I purchased these through more beer because I knew it was exactly the proper o-ring to fit my water filter. Exactly what I wanted
I use the water filters for filtering most of my brews. Honesty, I'm still using the original o-ring after 2 years with no issue. BUT, I still have this replacement o-ring, which provides great peace of mind. 5 stars because I'm sure this one is as durable/dependable as the original - it just keeps on going!