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14 of 14 found the following review helpful:
 Best overall solution presta valve extenderFeb 18, 2007
By Ignacio Bustamante
"Endurance Cyclist"
Only need one extender to inflate many tires. With this Topeak presta valve extender, you do not need to leave in place the extender once it is installed, since this extender features a plunger that is used to tighten/untighten the the knurled nut on the existing presta valve.
Procedure I use: Screw the extender onto existing valve, push the plunger down to engage the valve nut, losen the nut and proceed to inflate. Once the tire is properly inflated, tighten the nut, disengage the plunger by pulling it up few milimeters, and remove the extender by unscrewing it. Repeat as necessary on as many tires as you wish.
If needed for competition conditions, you may use two extenders and leaving them in place on each tire for fast access. There is no need to use teflon tape with these extenders, since you are using the existing valve nut to close it down.
The only drawback with this product is, that you may not be able to tighten the presta valve's knurled nut real hard as you may have been accustomed to, and could become lose with road vibrations, thus leaking some air. This has not happened to me since the three months I have been using this valve extender.
 Mehh, does not really work, cheap plastic insidesNov 18, 2011
By M. Hayner
"Truth Time"
The extender looks good on the outside, but the threading inside the extender is a plastic insert (too weak to hold a seal or hold on the bike over time) so if you Teflon tape and then try & really snug it down the treads will pop in the extender, thus making a bad seal and something that will likely fall off later. You want an extender with a machined thread, not a cheapo plastic insert.
 Great Presta Valve Extension Solution!Oct 10, 2011
By C. McColm
The Topeak Presta Valve Extenders work great--as long as you can read and follow directions. :-) I've used these on my Zipp 303s & 404s, Hed Stinger 5s, and Neuvation C50 tubular wheels with Vittoria and Continental tubular tires.
From looking at the (generally) bad reviews, I think people are messing up in a couple ways. First, you need to use Teflon plumbers tape with these and pretty much all valve extenders. I've used several (e.g., Zipp, Rolf Prima, Stan's, etc.) and have found this to be the case. Second, make sure you wrap the tape clockwise (when looking down on the presta valve), because this way you will tighten the Teflon-taped seal when installing the Topeak extender. Third, open the presta on the tube *before* you screw on the Topeak extender, because the extender seems to "lock" onto the presta valve better this way. Fourth, test to make sure you have a good, airtight seal before installing your tubular tire on the wheel. Finally, practice opening and closing the presta valve via the Topeak extender before you install your tire on your wheel.
The Topeak extenders work very well *when you take the time to know how to use them properly*! :-)
I would recommend these to anyone needing a presta valve extender on for their tire-tube-wheel system. Thanks!
LeakySep 06, 2011
By rr707
Was not able to use this to inflate my tubes because it didn't seal properly.
I'm not sure if my unit was defective or if it wasn't compatible with my tubes. Regardless, this product was a waste of $7 and is going in the trash.
Didn't work wellJan 31, 2011
By K. Moseley
I tried three of these in different sizes for my HED wheel and could never get the seal between the extender and my valve to work well. You can not tighten these hard enough to get a good seal or they strip the threads. I ended up buying extenders where you could take out the core and put it into the extender. They work great; as long as your tube has a removeable core, I would recommend this approach.
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