Hey @EdwinB, welcome to the forum! Feel free to introduce yourself if you’d like!
Thanks for reporting this issue! Would you be able to share the Speckle commit that you are trying to import into Revit. You can do this either by making the stream public and sharing a link to it, or by adding me (Connor Ivy) as a collaborator. If there are intellectual property restrictions or something along those lines then maybe you could create a new commit that just contains the pipe networks?
once I have access to the Speckle commit that is failing to import correctly, I can find why it isn’t importing correctly and try to fix it 