During a recent Krill Systems installation, I was pleased to find that Garmin "Tees" made the layout more convenient. The keyway alignment on their "Tees" enabled me to connect three N2K devices to each other without drop cables. The advantage of this is space saving (no coiled up / service loops in drop cables), cost in less drop cables and fewer actual connections.
I was unable to achieve this with Maretron (Molex) "Tees".
Picture to follow.
Thanks, Louis, but I've been able to make tee-to-tee connections with every brand I've tried -- Garmin, Airmar (Furuno), Lowrance, and Maretron (both Molex and Turck). I've even mixed brands sometimes but then they don't line up in a flat way that you can fasten to a surface well.
But Maretron has used two, maybe three, manufacturers during the years, and you problem might be from mixing different generations of Maretron tees?
Incidentally, for large networks Maretron recommends using multiports instead of ganged tees. That way the slight impedance disruption created by 2nd, 3rd, 4th, and 5th tee is kept off the backbone, i.e. moved to a drop line.