The company Canature owns more than 100  patented technologies All products Canature qualified by RoHS standards and NFS and TUV certificates. Our independently designed and manufactured check valves are with NFS and CE certificates. In order to ensure the high quality of our products and to achieve environmental guarantee all products Canature certified at the factory in accordance with ISO 9001 and ISO 14001. China's government marked the company Canature nationally significant producer.