Silicone Rubber O-Ring is a simple and versatile ring-shaped packing or sealing device with a circular cross section. The opposite side of an O Ring are squeezed between the walls of the cavity or gland into which the O -Ring is installed. The zero clearance within the gland provides an effective sealing and blocking the flow of liquids, and gases through the glands. Internal pressure dynamics and static. O-rings are available in a variety of materials, in both standard and custom sizes. Our proprietary compounds are designed to perform in a wide range of applications with varying chemical exposures, pressures and temperatures.