Note 2: Due to change in the design of this meter in August of 1987, it is necessary to determine whether your meter is of current or previous design. Standard serial numbers up to and including 5015, and special serial numbers up to and including 200779 are considered previous design. Numbers higher than those are current design. These numbers can be found on the nameplate of the meter and on the stator.
Class 150 and 300 American Society of Mechanical Engineers (ASME) B16.5, 125-250 Arithmetic Average Roughness Height (AARH) finish raised-face (RF) flanges
Class 150, 300, 600, 900 ASME B16.5, 125-250 AARH finish raised face (RF) flanges