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Cioks Stack Flex 5,5/2,1 mm DC Centre-negative

If your power supply does not have a dedicated 18V outlet you can use type 1 Stack Flex to power an 18V pedal using 2 isolated 9V outlets. Most common 18V pedals are those from MXR, Pigtronix, some Whas and drives like OCD which accepts higher voltage than 9V.