Continental Conti Valve Extender (Pack of 2)

These seem great in theory, but they only seem to be compatible with Continental valves where the valve itself screws out of the valve stem. Trying to mount these on a Vittoria tubular tire in a deep section carbon rim just depressed the valve and made me lose all the pressure, yet wouldnt even thread onto the valve.

i bought a set of zipp 808s and needed these to fit over my valves. they work exactly as described and now i dont have to worry about being stranded if i get a flat!

work well and much better than the external valve extenders, just remember to use some white teflon tape on the threads to seal everything up well

I finally figured out how to use these, sorry for my previous review, it was my fault for not asking.

I have a Dahon folder which came with deep rims and tubes with long, long valve stems. When I wanted to add sealer against thorns, I could not find tubes with removable presta valve cores that had a stem long enough to fit the rims. Their valves just barely peeked out from the rim with not enough room for a presta pump to fit. So I used these extenders to solve the problem. Now I can add sealer. These can be transferred to new tubes if necessary. Perfect solution. ***FOLLOWUP SEPT 10, 2016 *** SUBTRACTING TWO STARS FOR DELICATE CONSTRUCTION I had trouble with one of these extenders and had to order another set. The seal on the end (the white ring in the photo) broke off in one extender. The sealer I added had jammed this end and I could not add air to top off the pressure. I unscrewed the valve core from the outer end of the extender and pushed a wire down the tube to clear the lump of sealer. It held air OK that time. But the second time I topped off the pressure, the same thing happened and it would not take air. This time I unscrewed the entire extender, but the end with the white sealing washer was damaged, probably from the time I had unclogged the tube before. The end with the white washer broke off entirely, so the tube would no longer hold air even when I tried teflon plumber tape to the threads. THE END WITH THE WHITE WASHER SEAL IS EXTREMELY DELICATE AND WILL BREAK EASILY. I had to reorder a second set because once the sealer washer is broken it will NOT hold air. Perhaps it would if you were to glue this section to the original valve stem with something like Gorilla Glue, but then you could not remove the tube when replacing it (the extender is larger diameter than the rim hole). I would much rather these extenders be made from a more durable metal, brass or steel. So I took off two stars for how delicate these are and how vulnerable the essential seal is to breakage. The wall thickness of the sealing end is too thin for the alloy it is made from. Note the sealing washer fits over a reduced diameter tube at this crucial point. Otherwise these work well.

Once I understood how to use the included wrench to remove the valve core and screw into these extenders they worked like a charm. I have used two other brands and types and these by far work the best.

Worked well

These things are super long. I wish they were black to match my theme but they go on without a hitch. nice little tool in the pack to tighten the stem and screw/unscrew the presta stem. ZERO leaks. Awesome stuff. dont hesitate to buy these if you have a set of deep V wheels.

They work well!!

I appreciated finding these for a good fair price. They do what they are supposed to do and they are much better than other options like the silca valve extenders which can get stuck inside the valve port of some wheels (like my flo 60 carbon wheels)