Shenzhen City, Duzhibao Technology Co., Ltd., also known as Shenzhen Toppo Technology Co., Ltd. and operating under the "镀之宝" brand, is a contract manufacturer based in Shenzhen, China. Established in 2007, the company specializes in the research, design, and manufacturing of corrosive liquid heating and cooling solutions. With 11 to 50 employees, they offer a comprehensive range of products including Teflon heat exchangers, fluoroplastic heat exchangers (FEP, PTFE, PFA), PP shell-and-tube heat exchangers, titanium heat exchangers, and various acid and alkali resistant liquid heaters. Their product portfolio also extends to electroplating power supplies, filters, plating baths, and industrial electric furnaces. The company holds National Invention Patents and independent R&D Patent Technology, emphasizing quality, energy saving, and safety in their production processes. They provide customized solutions and one-stop services for industries such as electroplating, chemical, mining, machinery manufacturing, and aquaculture. They are recognized as a high-tech enterprise focused on energy conservation and environmental protection.