I'm hoping someone can shed some light on this situation. I'm in the process of lowering my incoming residential water pressure. I purchased a new +/- 1% tolerance liquid filled gauge to do this. This is a 3 year old home and the existing pressure is 74 psi. I want to lower it to a traditional 55-60 psi. I have a Honeywell water pressure regulator (D06F-XX) I'm trying to adjust. According to their instructions I must shut off the water inlet valve and open the water tap, before an adjustment can be made. I assume this is to relieve pressure from the regulator in order to be able to adjust it down. The problem I have is, what looks to be an incoming water main ball valve in an irrigation labeled box. I assume this because the box is located almost directly across from the city meter and the hose type looks identical to each other. When I turn the ball valve off, the water at the hose tap runs continuously. I initially bled off about 2 gallons. Do I need to run it for an extended period of time to purge the system? I've attached a few pic's. Maybe someone can give me some direction. I really don't want to spent $60 to have a plumber show me how to do it. Thanks