The Power Ace Current Doubler Y-Cable is a high quality vcurrent doubling adapter cable for effect pedals to combine two separate, isolated 5.5 x 2.1 mm power slots, e.g. 2 x 150 mA to 300 mA.
RockBoard Power Ace Current Doubler Y Cable, 2 x 2.1 x 5.5 mm barrel plug (parallel) to 2.1 x 5.5 mm barrel socket