This is the common UL and ULC Standard for Water Fire Extinguishers. It is the Fourth edition of CAN/ULC- S507, and the Eighth edition of ANSI/UL 626. These requirements cover the construction and performance, exclusive of performance during fire tests, of water fire extinguishers. Water fire extinguishers are intended to be utilized in accordance with the Standard for Portable Fire Extinguishers, NFPA 10, and the National Fire Code of Canada. These requirements cover stored-pressure, water fire extinguishers that use a single chamber for both the extinguishing agent and the expellant gas. The extinguishers covered by these requirements may be charged with plain water, an antifreeze or a loaded-stream solution. The requirements for performance during fire testing of stored-pressure water fire extinguishers are specified in the Binational Standard for Rating and Fire Testing of Fire Extinguishers, ANSI/UL 711/CAN/ULC-S508.