Dictomatic Americas | O-Ring Houston O-rings are primarily used to create a seal in static and motion applications with high pressure and temperature settings. In extremely high temperature conditions, o-rings should have a Viton material coated in Teflon® to maximize equipment performance and operating time. Available in standard AS568 and metric sizes, we provide standard and customizable o-rings in multiple durometers and materials at competitive low minimum quantities. Our high quality o-rings and accessories maintain a robust vigor and durability that will maximize equipment performance.