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Single power cable needed..will this work?

I need a single pedal powered. I can do this from my Korg pitchblack tuner, but I need a single power cable, male to male. I have two battery adapters that came with another power supply, can I clip them together and that work? Or would it change the polarity? I will try to 41iRKokoNRL._AC_SY400_.jpg attach a picture of what I have.
 
It the two you have are the SAME polarity, yes they will reverse the polarity. I've also seen these (have some in my junk drawer somewhere), that came reverse polarity, and one of each would work. Just test it with a VOM. OR go to the music store, shell out the four bucks for the cable you need.