[MENTION=168558]Drillium Dude[/MENTION], agreed.
On these valve adapters, I have a few, but only use one all the time here. Years back I picked up a pack from somewhere local, and when I went to use one of those new ones, it would not keep a seal. When I compared it to my old one I found that the little O ring in the Presta side was much thinner. Haven't gotten around to replacing them.