This architectural drawing is Mainline trench detail in AutoCAD 2D drawing, dwg file, CAD file. The irrigation system's main line is the pipe that carries water from the backflow preventer to the remote control valves. This is typically the largest pipe in the irrigation system, and it is upstream from the remote control valves. It is typically under constant pressure. For more details and information download the drawing file. Thank you for visiting our website cadbull.com.