A 'RING FIBER/COPPER OIL PIPE' is a vital component for classic Citroën models like the 11CV, 15CV, and ID 19. This ring acts as a sealing element between oil-bearing components, crafted from fiber and copper, to prevent leaks. It is specifically designed to fit within the engine compartments of these vehicles, ensuring durability and optimal performance. This ring is crucial for maintaining oil pressure and protecting internal engine parts. Proper installation and periodic replacement can help extend the engine's lifespan and avoid costly repairs.