3-2-3 xConnect No Power Pass Through Injection T
These require the Ray Wu 2 core pigtails for the power injection extensions. Available here.
These are wired so you don't cross power supplies. The power pin is removed from the inbound connector. Negative and Data passthrough so you can power inject from different power supplies.
These Connectors have a noticeable white cap on them so you can identify which of your power injection T's share positive power and which do not.