OEM‑compatible O‑Ring (0663210596) for Simba M4C, Boomer M2D, Boomer T1D, Simba M40S, Boomer XE3C, Boomer 291, Simba H1354, Boomer 281, Simba S7D, Boomer L2D, Boomer S2, Boomer 282, Boomer M2C, COP-2160, COP-2560, COP-SC25, COP-SC25X, and Boomer S1D drilling equipment. Made from rubber, this wear/seal spare part seals joints and prevents fluid leakage in hydraulic breaker and rock drill systems, ensuring reliable operation.