This standard pertains to the various types and classes of wet-barrel fire hydrants for use in water-supply service in areas where the climate is mild and freezing temperatures do not occur. A wet-barrel hydrant has one or more valve openings above the ground line and, under normal operating conditions, the entire interior of the hydrant is subjected to water pressure at all times. Each outlet nozzle has an independent, compression-type valve (i.e., working with or against the pressure) that controls discharge from that particular outlet. This standard does not pertain to dry-barrel fire hydrants. (For such hydrants, see ANSI/AWWA C502, Standard for Dry-Barrel Fire Hydrants.) Requirements are given for the following topics: permeation; data to be supplied by the purchaser; drawings or data to be furnished by the manufacturer; materials; general design; detailed design; coating; workmanship; inspection; fire-hydrant component tests; production tests; rejection; handling; and, packaging. Appendices cover characteristics of national standard fire-hose coupling screw threads, and uniform color scheme for fire hydrants.