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hi @paris

as for the null values - I am sorry but there was a mistake in the output part of the script.
This is the corrected version, that should not produce null values (unless there is a reason for that)
However I think the unassigned system problem is still there - judging by the pipe colours.
As I probably said before, I have never used much MEP part of Revit and do not have much knowledge on it specifics. I do not have any ideas now about those unconnected caps and tees (don’t really know how they work in Revit). Sorry about that, If anything comes to my mind I will let you know. Although I am afraid that it might be a problem with BreakCurve method maybe and should be fixed separately ?

import clr

clr.AddReference("RevitAPI")
import Autodesk
from Autodesk.Revit.DB import *

clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

clr.AddReference('RevitNodes')
import Revit
clr.ImportExtensions(Revit.GeometryConversion)

doc = DocumentManager.Instance.CurrentDBDocument


elements = UnwrapElement(IN[0])
points = UnwrapElement(IN[1])


output = []
children = {}

TransactionManager.Instance.EnsureInTransaction(doc)

for e, p in zip(elements,points):
	to_check = [e]
	if e.Id in children:
		to_check.extend(children[e.Id])
		
	splitId = None
	for ec in to_check:

		if isinstance(ec,Autodesk.Revit.DB.Plumbing.Pipe):
			try:
				splitId = Autodesk.Revit.DB.Plumbing.PlumbingUtils.BreakCurve(doc, ec.Id, p.ToXyz())
				break
			except:
				pass				
		elif isinstance(ec,Autodesk.Revit.DB.Mechanical.Duct):
			try:
				splitId = Autodesk.Revit.DB.Mechanical.MechanicalUtils.BreakCurve(doc, ec.Id, p.ToXyz())
				break
			except:
				pass
			
	if splitId:
		split = doc.GetElement(splitId)
		if e.Id in children:
			children[e.Id].append(split)
		else:
			children[e.Id] = [split]
		output.append([ec,split])
	else:
		output.append(None)
			

TransactionManager.Instance.TransactionTaskDone()
			

OUT = output
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