Here's what Cioks have to say about the Flex Daisy Chain Cable:
This Flex cable makes it possible to power three pedals using only one outlet of the power supply. You need to make sure that the three pedals can all be powered by the same voltage and that they all use the most common 5,5/2,1mm centre negative DC plug, the BOSS standard. On this daisy chain the first DC plug is 50cm from the plug which goes into the power supply’s outlet. There’s 30cm in-between the first and the second DC plug and also 30cm in-between the second and third DCplug. The total length of this special Flex cable is approx. 110cm. The longer distance between the plugs gives you more freedom in placing the pedals you’d like to power with the daisy chain on your pedalboard.
When using the daisy chain Flex make sure that the sum of the three pedal’s currents in mA stays below the max. current rating of the outlet used. Please also note that the daisy chain Flex cable has all three DC plugs connected in parallel to the power supply’s outlet. To avoid noise issues we recommend using the daisy chain Flex with analogue pedals only. This is to avoid the risk of a digital pedal introducing noise into your guitar signal when being powered in a parallel connection with a simple analogue pedal.