The union sealing ring  is made of imported rubber material, which greatly improves the pressure bearing capacity and sealing performance of the joint, and prevents joint corrosion. The sealing form varies according to pressure and application range.It has good sealing ability in gas and fluid applications, with high initial sealing force, good leakage resistance, and can be used in large sizes without the need for installation tools. It can adapt to rapid temperature changes and has good sealing ability for poor surfaces. The storage period is not limited.