Type BB / concave, uncut (Custom)

Back-up Ring Type BB is a concave, uncut ring designed to prevent extrusion of O-Rings and other seals under high pressure. Installed in the groove behind the primary seal, it supports sealing elements in static or dynamic applications. Made from high-performance materials like PTFE or elastomers, Type BB enhances seal reliability, extends service life, and is ideal for use in high-pressure hydraulic and pneumatic systems. This is a Custom Article Number with a Customer Specific Design.