I have Truetone 1spot CS12 that has 2x 18V jacks. Since I dont have any 18V pedals, but needed extra power for new pedals, I bought this adaptor. The important things about this product is that the green jack must go into the pedal. The cable is long enough so that I was able to have the bulky adaptor part under the pedal board (Pedaltrain Classic), so it's out of way.
So far it works great and has been headache free.