Made of high-quality oil and corrosion resistant raw materials, it is firm, flexible and resistant to pressure and deformation. It is not easy to be damaged or aged under long-term oil pressure. With high interface matching degree and excellent tight sealing performance, it ensures smooth oil delivery and avoids oil leakage and flow interruption. It conforms to original factory standards and is easy to install. Suitable for ZF 12AS, 16AS series heavy truck gearboxes and various Sinotruk Howo gearboxes, widely used for gearbox oil circuit maintenance.