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.
This splitter adapter cable divides one Pedal Power output to two pedals. The splitter has two 2.1mm jacks which will connect to any 2.1mm plug. The white stripe cable is ground lifted to eliminate ground loops.