Made of high-strength cast steel in one piece, uniform texture and excellent toughness, impact-resistant, suitable for heavy-duty working conditions of ZF 1358 series gearboxes. Adopting precision die-casting process, the inner cavity is neat with perfect fitting performance and excellent sealing effect, effectively preventing oil leakage. It resists high temperature and deformation, keeps stable structure under long-term vibration, well protects internal transmission parts. Wear-resistant and corrosion-resistant, easy to install and disassemble with strong versatility, ensuring stable and smooth operation of the whole transmission system.