This is the same material that the Original Equipment Manufacturer uses. High Quality Viton®/FKM stands up longer to harsh chemicals and in this case chlorine. This o-ring is made from Viton® Type B which exhibits additional chemical resistence over standard Viton A or general purpose FKM.
The nominal dimensions for this o-ring are 5-1/8" ID X 5-1/2" OD.
1 seal per package