SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

that is called a master valve. The purpose of the master valve is so that the manifold is not under pressure, making repairs easier and if something breaks in the valve manifold it wont matter. i dont pertically see any purpose once so ever because the errors that they might avoid dont regularly ever happen. When the sprinklers turn on the master valve turns on water to the regular valves. It is not a necessary step to take