To prevent the leakage of oil products from contaminating the soil at the pipeline joints of underground

oil tanks in gas stations, and to prevent groundwater from entering operation wells and corroding the

metal joints in wells, is a container for protection of the joints, valves, pumps and underground pipeline

joints of underground oil tanks in gas stations. It can also provide a protection for underground oil

tanks themselves. Clean space connected with the ground to facilitate future maintenance and

maintenance.