IQ. The new Q Terminator is the terminator cap you need with the new Enphase Q Cable.
What's a Terminator? The Enphase IQ system connects a IQ6+ (or IQ6) microinverter to each PV module (DC connection) and then each microinverter connects (AC connection) to the new Q Cable via preinstalled ports on the Q Cable. One end of the Q Cable is wired directly into the junction box at the head of the branch circuit, eliminating the need for a separate AC interconnect cable. The other end is sealed from the environment using one of these Q Terminator caps.
How many do I need? A single Q Terminator is needed for each branch circuit. Each branch circuit of Q Cable can support up to 13 of the IQ6+ microinverters (@ 240VAC). A center feed requires 2 Q Terminator caps per branch.