For pedals with higher power requirements, use this current doubling adapter with a 2.1mm jack to combine two Pedal Power outputs. (Frequently used to combine outputs 5 & 6 on a Pedal Power 2+ to create a single 9V 500mA output.) This adapter will accept any cable with a 2.1mm plug.
Current Double Adapter
Connectors: 2.1 mm Straight Barrel Plug (2x)
Polarity: Standard (Center Negative)
Length: 4" / 10 cm
NOTE: Combine 2 Pedal Power CD Outputs to increase current