Originally Posted by Wet_Boots
Since they now have ball valve curb stops, you'd have to get more precise and use something older in design, because even a Ford ball valve will require winterizing in sprinkler applications.
I only spec curb stops on iso valves that are deep, subject to ground water or you cant see them. Never understood why people put ball valves in the same box as the backflow. Saw one once where the installer put a gate valve before and after the backflow or the plastic globe valves