NMEA T connectors have a slot/tab arrangement on the connectors to assure the pins are lined up properly.  On this Garmin T the slot/tab is oriented about 45 degrees different from the Lowrance brand T.  They still mate up and work but don't lie flat together.  One or the other is going to stick up a little.  Using the same brands is advisable if you are going to hook several T's together without a cable between them.