I have a sprinkler system that was installed with a neighbor over 15 years ago. I have been bad heads and valves. The main coming in is 3/4" PVC and the neighbor choose to go with 3/4" PVC for the entire system. With that said I will not be redoing the entire system with 1" PVC, but I do want to bring the system up to code and install a PVB. 1. Should I go with a 3/4" PVB since the system is 3/4" or should I go with a 1" PVB and use 3/4" to 1" coupling before entering the PVB and upon existing t...
