R & S #350AM Material: Buna N FDA / NSF61 Food and Drinking Water Safe O-Ring for Amway E84, E85 and E-0085 & Gen IV Water Treatment SystemSta-Rite Crystal Flo II 27-2541 o-ring Durometer 70A Made In USA 30 Day Warranty Complete Return Policy O-Ring problems: Send us your old O-Ring that worked and we will find you the proper O-Ring.