OEM‑compatible Stop Ring (3115212380) for Simba H1354, Boomer 281, and Simba S7D hydraulic breaker systems. Made from durable rubber, it functions as a wear-resistant retaining component, securing pistons and internal assemblies to prevent axial movement. Designed for underground drilling equipment, it ensures stable operation, reduces wear on connected parts, and prolongs the service life of the hydraulic system.