If you take the valve core out, you don't need the adapter. You can press a standard air hose valve against the presta valve without the core inside. It's a bit of a juggling act to put your finger over the hole with one hand and get the valve core ready to install with the other hand, but it works much better than trying to inflate it with the valve installed. The valve just won't allow enough volume to enter the tire, quickly enough to seat the tire.