Backup Rings Manufacturers, Suppliers & Exporters In India. Backup rings, also known as anti-extrusion rings or support rings, are mechanical devices used in conjunction with O-rings and other elastomeric seals to prevent extrusion or nibbling in high-pressure and dynamic sealing applications. The primary purpose of backup rings is to provide support to the elastomeric seal, enhancing its resistance to extrusion into clearances and preventing damage caused by high pressures or aggressive media. Backup rings are commonly used in hydraulic and pneumatic systems, where high-pressure sealing is required. They find applications in industries such as aerospace, automotive, oil and gas, and general engineering.