This standard describes the various types and classes of propeller meters in sizes 2 in. (50 mm) through 72 in. (1,800 mm) for waterworks applications. These meters register by recording the revolutions of a propeller set in motion by the force of flowing water striking the blades. Major revisions to the standard include guidance on selection of materials in terms of chlorine and chloramine degradation of elastomers and provisions for meter marking have been moved from Sec. 6.1 to Sec. 4.4.