I used this to replace the nozzle on my Topeak Joe Blow Sport that would no longer seal. It installed easily and works great. In fact, I prefer this nozzle to the original Topeak. (Note: I've only used this on presta valves)
This pump head attachment is excellent it fixed my compresser gun that had a dual side for each valve style taken from a floor pump. This new one went on super easy and rotates freely so is easy to use on either valve style and easily so I can see my air gauge on my gun too. I use it on both stem types and my car and it is excellent especially for $10!!!
This is a great replacement part for me because it upgrades the cheapo tire pump I bought (not from tree fort bikes) only a couple months ago. It was packed well and shipped quickly.
I'll be back the next time I need a bike part.
Owning my first presta valved bike for about a year now, but it was difficult adding air to the tires. I don't ride often (weekly) and was using a standard chuck on my compressor. This eventually damaged the valve stem.
I didn't want to by a pump since I have a compressor, solution: the "Air Bob".
I unscrewed the nipple, applied some teflon tape, then an adaptor. PERFECT!
Now I just snap the Air Bob onto my air hose, fasten it onto the valve stem, open the air s/o valve-done.