Hi Garry, take a look at the MEPover package. I would first get all of your pipes, filter them to only include incorrect types, and then use the MEP Curve Connected Fittings node as noted here. If you just need to change the type of fitting, this should be rather simple, but if you need to use an entirely different family, you might have to delete the existing element, place a new family at the same location, and reconnect all of the loose connectors as you will not longer have a continuous system.
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