ZHUJI CITY ZENGSHI MECHANICAL TECHNOLOGY CO., LTD factory locates in Zhuji City, which is called China Hardware town. It's famous for HVACR parts. ZENGSHI tools represents over 28 years of technology and experience in these. Here you will find about the best quality with cost-effective products we sell and learn more about our sincere service. ZENGSHI tool is easily to use, with high efficient operation. Long guarantee to customer and we never compromise to quality control. Welcome to experience "ZENGSHI" tools, or do OEM. We produce: Charging manifolds Charging accessories Air conditioning and refrigeration valves Brass fittings Auto AC tools We are good at ALUMINUM MANIFOLDS, QUICK COUPLERS, VALVES.