This cable used for the power distribution of 2 SATA-HDD's over one SATA 15-pin port of the PC power supply.
DIGITUS Internal power supply cable
Product number: AK-430405-003-M
EAN: 4016032382140
Internal Y-power supply cable M/F/F, 0.3m, SATA 15-pin - 2x SATA 15-pin
Safe connection and power supply