These regulators can operate under constant pressure. This means that you can use a single pressure regulator for multiple zones. This regulator must be located after the filter, since it is designed to work with clean water. Preset pressure from 10, 20, 30, 40, or 50 PSI and flow rates from 0.5- 18 GPM.
These are 3/4" FPT Inlet x 3/4" FPT Outlet