For DKI, DKU and DKOR plate-type directional valves, the following connector options are available according to DIN 43650-A / ISO 4400: SP-666 - standard connector for direct connection to a DC or AC power supply. It has a protection class of IP65 DIN 40050. SP-667 is a standard connector for direct connection to a power supply, with a built-in LED. Has a protection class IP65 DIN 40050. SP-669 - with a built-in rectifier bridge for supplying direct current (DC) coils from an alternating (AC) circuit. Has a protection class IP65 DIN 40050.