P3Solar (formerly Global Solar) 28002RC Barrel to Barrel Adapter.
4" 18 AWG zip cord and 2.5mm ID x 5.5mm OD barrel jack & 2.1mm ID x 5.5 mm OD plug
4" 18 AWG zip cord and 2.5mm ID x 5.5mm OD barrel jack & 2.1mm ID x 5.5 mm OD plug
Use this adapter for adapting different size barrel adapters. Required for some devices for power input.