The Enphase Q Terminator cap is used with Enphase IQ inverter systems to terminate the unused end of the Q Cable. The center feed requires two (2) per branch. The IQ Terminator cap locks in place over unused cable ends to protect the wiring from short-circuits. Terminator caps permanently lock into place and must be replaced when removed. The Q Terminator caps are intended for one time use. * 10 units per pack