0501221839 Heat Exchanger, compatible with ZF 12-speed and 16-speed gearboxes. The reasonably arranged pipelines deliver high heat exchange efficiency to quickly dissipate heat generated during gearbox operation and keep oil temperature within normal range. The pressure and corrosion resistant shell prevents pipeline blockage and leakage. Compact in structure, it fits original installation position perfectly for easy assembly and disassembly. It avoids oil deterioration and component aging caused by overhigh oil temperature and greatly enhances the stability of gearboxes under heavy-load and long-time operation.