The Enphase Q Terminator cap is used with Enphase IQ inverter systems to terminate the unused end of the Q Cable. Typically one or two terminator caps are required per branch circuit. The IQ Terminator cap locks in place over unused cable ends to protect the wiring from short-circuits. Terminator caps permanently lock into place on the end of the Q Cable and must be replaced if removed. * Shipping cost will be determined and charged after you put the order. * Picture for illustration purpose only.