DC Power Plug Size Adapter | 2.5 X 5.5 (mm)  to 2.1 X 5.5 (mm)  JR1831 Jameco. 1 piece 

DC Power Plug Adapter

This adapter will convert the 2.5mm plug on the end of your power supply to a plug with 2.1mm ID.

Features

• Size: 2.5mm male jack to 2.1mm female plug
• Length: 1.4 inches