Established in 1993, Zhejiang Hongda Special Rubber Products Co., Ltd. is famous China Battery Safety Valve Manufacturers and Wholesale Rubber Safety Relief Valve Suppliers. The company is located in Zhoushan, the eastern immortal Island with beautiful scenery and outstanding people. We are professional manufacturer of safety valves, safety caps, explosion-proof discs, terminal post sealing rings, O-rings, acid injection nozzles and polymer microporous plastics for lead-acid batteries, lithium batteries and supercapacitors. The company has become a well-known high-tech enterprise through continuous innovation, reform and development.