ADAPTER USB 3.0 TO USB 2.0 ITEM NO.: 88885217 Adapter USB 3.0 to USB 2.0, 9Pin. You want to connect your new Midi-Tower with two USB 3.0 front connectors and internal USB 3.0 pin header (19pin) to an older motherboard, that doesn't have an internal USB 3.0 connector? Then this convenient USB 3.0 to USB 2.0 adapter is the perfect solution for you! It turns every case with an internal 19pin USB 3.0 front connector, to an 9pin USB 2.0 connector block.