Senninger Medium Flow Regulator-3/4" 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. Medium Flow handles rates between 2 and 20gpm (1200gph maximum capacity). 10 psi regulator handles 4 to 16 gpm (max. 960 gph). Also available in 1" pipe thread. Ship wt 1#.