These are high quality reproduction bowls. They are UV resistant and chemical resistant. They will fit Clinton, Lauson, Jacobsen and Continental. There may be others I am not aware of. They will also work on the hang down type filters by cutting off the pilot flange. I have had one person say they will work on Briggs but from my research I don't believe they will work. These are sold with no warranty given or implied. Cost is 25.95 EA. I can give discounts on purchases of 3 or more.