The Hitachi 4626104 is an authentic OEM seal kit designed for the boom cylinder of various Hitachi EX-5 series excavators. This comprehensive kit provides essential seals to maintain hydraulic pressure, prevent leaks, and ensure the optimal functionality and longevity of the boom cylinder. Manufactured to Hitachi's stringent quality standards, it guarantees a precise fit and reliable performance for models including EX200-5, EX210-5, EX220-5, EX230-5, EX270-5, EX280-5, EX300-5, EX330-5, EX350-5, EX370-5, EX400-5, EX450-5, EX550-5, EX600-5, EX700-5, and EX800-5.