Type 3 Flex cable is yellow and fitted with a centre negative 5,5/2,5mm DC plug. Now, this type of plug is very rarely seen with pedals. Three pedals we know use this standard and these are T-Rex Spindoctor, Line 6 AMPLIFi FX100 and Digitech JamMan Solo XT where the last one is not even for sure. JamMan Solo XT needs for sure a centre negative DC plug but we had a client who couldn’t fit in the standatd 5,5/2,1mm plug so we’ve made this yellow one with same standard BOSS polarity but for the larger 2,5mm pin. It’s only avaliable with angled (L-shaped) plug and only in 50cm length.
If you have green Flex cables to supply say your Eventides with 12V DC and would like to use another colour for an AC pedal which also has a 2,5 pin socket you can use this cable so you can distinguish them. With AC pedal the polarity doesn’t matter.