The JCB 45910010 is an original equipment manufacturer (OEM) back-up ring, specifically designed to prevent the extrusion of hydraulic seals under high pressure. Also known as an anti-extrusion ring, this genuine JCB component ensures the integrity and extends the lifespan of hydraulic systems in various JCB machinery. With an inner diameter of 100 mm, an outer diameter of 108 mm, and a thickness of 2.5 mm, it provides critical support for seals, maintaining optimal hydraulic performance.