In this photo, We were working on.... Sprinkler System Design
This is an older detailed drawing of how we set up our pressure vacuum breakers. If all possible, we now run brass all the way up and through the backflow prevention device back to the ground. We have found that the brass eliminates the possibilities of breaking when something bumps the backflow. This drawing still give you an idea of how we put them together. We still may use this detail in our sprinkler system designs.