On December 22, 2020, we obtained the UL certification of the ISO centrifugal pump. UL is the abbreviation of Underwriters Laboratories of the United States. It is the most authoritative in the United States and the largest private organization engaged in safety testing and appraisal in the world. It is an independent, profitable professional organization that conducts experiments for public safety. It uses scientific testing methods to study and determine whether various materials, devices, products, equipment, buildings, etc. are harmful to life and property. It is mainly engaged in product safety certification and business safety certification business, and its ultimate goal is for the market to obtain products with a fairly safe standard, to contribute to the assurance of personal health and property safety.