This standard covers the various types and classes of cold water fire service type meters in sizes 3 in. (80 mm) through 10 in. (250 mm) and the materials and workmanship used in their fabrication. A fire-service meter shall consist of one of the following: A combination of (1) a mainline meter of the turbine type (Class II), either Underwriters Laboratories listed or Factory Mutual Research approved; (2) either a UL-listed or an FM-approved fire-service strainer; (3) a bypass meter of the appropriate size for measuring low flow rates; and (4) an automatic valve for diverting flow rates other than fire demand through the bypass meter. A combination of (1) a mainline meter of the turbine type (Class II), either UL listed or FM approved; and (2) either a UL-listed or an FM-approved fire-service strainer. Major revisions to this edition of C703 include the following: 1. Type I devices, proportional fire-service meters with check valve, are no longer addressed in this standard 2. Information is provided on lead content criteria and recent federal legislation revising the definition of "lead free" in the Safe Drinking Water Act. 3. The definition of manufacturer has been changed. 4. The materials have been updated in response to legislation revising the definition of "lead free" in the Safe Drinking Water Act. 5. The section on registers has been updated to include requirements for electronic display registers.