Weifang Jiutong Industry and Trading Co., Ltd. invented and pioneered the copper fitting , which quickly established copper plumbing as the global standard of the industry. Today, we offer one of the most complete lines of copper fittings available - all from a single source. Our fittings are engineered and manufactured by the most experienced company in the business - they are legendary for consistent quality and workmanship across the entire line. Our state of the art manufacturing ensures each fitting meets applicable standards and tolerances.