UL 331 CRD-2012 可燃液体和无水氨用滤器的UL安全标准. 节/段落参考: 新1.4和新补充件SA主题: 非饮用水用滤器 (第八版: 2008年2月25日)
UL Standard for Safety Strainers for Flammable Fluids and Anhydrous Ammonia - Section / Paragraph Reference: New 1.4 and New Supplement SA Subject: Strainers for non-potable water (Edition 8: February 25@ 2008)