Direct replacement for OEM part number 42538856、42538857、42538858 perfectly matches the transmission output shaft of Iveco Stralis heavy-duty trucks and construction machinery gearboxes.Constructed from high-performance FKM rubber and steel skeleton, resistant to high temperature, high pressure and long-term oil immersion, suitable for heavy-load transmission working environments.Adopts precision-molded lip structure with built-in tension spring to ensure tight fit with the shaft surface, effectively preventing transmission oil leakage and external dust intrusion.Designed for press-fit installation, compatible with original mounting grooves without modifications, reducing installation time and improving maintenance efficiency.100% tested for sealing performance under simulated working conditions, meets strict quality standards to ensure reliable operation and extend transmission service life.