Hi, This is my first post and question. The info may be buried in some of these topics already. If so, I apologize. I am overhead watering three acres using six zones with 1" pipe and valves throughout. So I have really good pressure. I have a 3/4" inch meter, but I am located almost 100 ft elevation below it - and feed by 1 1/4" supply line. I am amazed at the flow/pressure I can get given this downhill location. I need to install a RPZ in order to qualify for agricultural rates. I am afraid it will reduce my pressure and mess up all of the stations and the set up I have presently. I have squeezed just about everything I can out of it now with placement, sprinkler nozzles, etc. Question: Is there a RPZ that is known for it's minimal pressure/flow loss? Or would installing a 1 1/2" RPZ be a way to reduce any flow/pressure loss to the 1 1/4" main. I know that's a big question from a newbie, and that technically it is not a simple one, with the graphs, gpm, pressure, etc. But I am mainly asking for an opinion about the overall concept of any benefits of over-sizing a RPZ (as to pressure loss), and if any RPZ (1 1/4 - 1 1/2") is known for being the best at minimizing pressure or head loss.