Senninger Medium Flow Regulator-1". Female Iron Pipe Thread. For large systems where you need to compensate line pressure fluctuations due to varied field elevations, excessive pipe friction loss, changing pump pressure, etc. Handles rates between 2 and 20 gpm (1200 gph max capacity). 10 psi regulator handles 4 to 16 gpm (max 960 gph). Ship wt 1#.