3/4 in Cold Water Submeter - California certified, couplings sold separately, The Residential Polymer Water Submeters, available in Hot and Cold varieties, are versatile for residential measurement and verification application. Along with their compact design, the removable register allows for pressure tests and flush-outs without damaging the internal component. The submeters can be installed in both horizontal and vertical positions while adhering to AWWA C708 accuracy standard. Available in both hot and cold versions to meet specific needs of the space. Cannot be installed vertically in California or NTEP state.