Bicycle Air Injector Adapter, Dunlop to Presta

Bicycle Air Injector Adapter, Dunlop (old general clamp type) to Presta . Thanks

Tip : How to inject air by Presta adadpter.
First, press down on the presta cock 1~2 times gently, so Release air a little and Attach above adapter. then inject air again to full pressure.