List Price: $18.95
Sale Price: $14.92
Today's Bonus: 21% Off
Yes it does Presta valves. No you are not missing any pieces. Yes the instructions on the box make no sense at first. Unscrew the head and you'll see a rubber stopper. It doesn't look it it comes out but lift the lock and you can pull it out. Then flip the two parts according to those instructions that now make more sense and put everything back together.
As for how it works, it does its job. Has a nice attachment to go under a bottle cage and feels nice and secure. As for inflating a tire, going from a new tube to 140psi is a pain. That's what a floor pump is for. This is for when you are out and need to go from a flat to enough to get back home. I bought this thinking I could only use this and after a few days, I bought a floor pump. That's not to say it can't get the job done, its just doing a job its not made to do.
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I got lucky, had this pump on my bike for only 2 days and then got a flat. Worked like a charm. Easy to attach to bike and the frame bracket that comes with this pump allows you to install this under a water bottle cage. This frees up for another water bottle cage! Good value for the money.