HYTOS

                if (item.TYPE == "Valves")

                    List<Symbol> group = new List<Symbol>();

                    SPPIDUtil.FindConnectedSymbolGroup(this, item, group);

                    List<Line> lines = new List<Line>();

                    foreach (var symbol in group)

                        foreach (var connector in symbol.CONNECTORS)

                            if (connector.ConnectedObject != null && connector.ConnectedObject.GetType() == typeof(Line))

                            {

                                Line line = connector.ConnectedObject as Line;

                                if (!lines.Contains(line))

                                    lines.Add(line);

                            }

                    if (lines.Count == 1 && !SPPIDUtil.IsBranchedLine(this, lines[0]) && SPPIDUtil.IsBranchLine(lines[0]))

                        Line line = lines[0];

                        if (line.TYPE == "Secondary" || line.TYPE == "Primary")

                            double startX = 0;

                            double startY = 0;

                            double endX = 0;

                            double endY = 0;

                            SPPIDUtil.ConvertPointBystring(line.STARTPOINT, ref startX, ref startY);

                            SPPIDUtil.ConvertPointBystring(line.ENDPOINT, ref endX, ref endY);

                            SlopeType slopeType = SPPIDUtil.CalcSlope(startX, startY, endX, endY);

                            if (slopeType == SlopeType.HORIZONTAL || slopeType == SlopeType.VERTICAL)

                                foreach (var symbol in group)

                                {

                                    if (!VentDrainSymbol.Contains(symbol))

                                        VentDrainSymbol.Add(symbol);

                                }

                                if (!VentDrainLine.Contains(lines[0]))

                                    VentDrainLine.Add(lines[0]);