Do you have more 18v pedals that you have 18v outlets on you Cioks power supply? Does one of them require the larger green 5.5/2.5mm center positive DC plug? FRET NOT. This handy device can convert a 9v outlet to an 18v in a snap! Just be careful. Make sure ONLY 18v pedals are used as pedals cannot take a higher voltage than they are rated. Also, this makeshift 18v output is limited to 50mA.