The Neptune family of positive displacement meters utilizes a nutating disc measuring chamber and a floating chamber design that is unaffected by meter position or in-line piping stresses. Nutating disc chamber designs offer the widest effective measurement of flow range. In addition Neptune provides a lifetime guarantee on the lead free bronze main case. All T-10 residential water meters meet or exceed the latest AWWA C700 Standard and are NSF/ANSI 61 Annex G and Annex F certified in all sizes from ⅝" through 2". Neptune T-10 water meters are time-proven for accuracy and dependability.