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Battery Safety Valve for AGM Automotive Start and Stop (HD-323). Patented Safety Technology: Owns patent for VRLA battery safety valve with acid filter and flame arrestor. Customizable Pressure: Gas open and close pressure can be designed upon customer request. Rigorous Quality Control: Components tested by IQC and OQC with standard testers to ensure quality. Extended Battery Life: Improves resistance to acid, flame, and water loss to extend service life. Premium Raw Materials: Sourced from top global suppliers with strict index testing. Comprehensive Testing Reports: Related testing reports provided for every batch of products.