An O-ring is typically made up of elastomer materials due to its attribute of resiliency. Some other materials are also used to form an o-ring seal including nylon. O-rings for housings are widely known as the most common seals that prevent the passing of air and liquid. O-rings are not affected by moderate chemicals and solvents. O-rings also have high tear strength and water-resistant properties. Order o-rings, o-ring lubricant, and other water filter parts from Serv-A-Pure today!