The German BURGMANN standard, the sealing ring is sealed by imported accessories, sanitary product structure design, no dead angle, no scaling, cleaning, sealing with wear debris recovery device, no contamination, and the major domestic sanitary equipment manufacturers do long-term matching are: Nanjing music company, Ningbo Lehui company, Huaian Aweisite Pharmaceutical Equipment Ltd, Hangzhou oulifa fluid equipment Co., Ltd. Hangzhou oulifa fluid equipment etc.