Got a 13 zone system with poor pressure. The system was left on for 3 years, year round, never winterized. The stations come on, just really low pressure. By the time it gets to the back of the property, the RB 5004's look like someone taking a leak, sad. Things I have done, not in order; replaced MV, did not work Checked water meter, backflow, no dice Dug up main line, after Water meter but before and after MV to see if the line had been collapsed, nope Check for leaks, one a lateral, repaired, still no go What else can I diagnose, backflow?, proper voltage on controller? Maybe a hidden regulator? ha ha Any help would be great!!!!! Thank You!!!!