Rubber O Rings Manufacturers, Suppliers & Exporters In India. Rubber O-rings are circular sealing elements with a round cross-section, typically made from various rubber compounds. These components are widely used in a multitude of industries and applications to create a reliable seal between two mating surfaces. Rubber O-rings are used in a diverse range of applications, including automotive, aerospace, hydraulic systems, pneumatic systems, plumbing, medical devices, and more. They are employed wherever a reliable sealing solution is required to prevent leakage.