Fouriers Tubeless Presta Valve Extender Kit Extension with Core nut (Pack of 2)

These worked out great I wasn’t confident but pleasantly surprised. Nice that out comes with stem removal nut. Good to go

Have used these on several different types of wheels including road and mountain. Like that you can get them in various lengths.

Works great if you have deep rims. Be careful you don't over tighten them though, you can break them.

Used these to extend the valves on Conti 700 x 25-32c inner tubes. Tool provided made it simple to remove valve and put extenders in place, and the rubber gasket on the extenders has been a champ at holding pressure (I did not use any plumber's tape, though I have it available). I am running the tires at about 95 psi, and might lose 1 to 2 psi over a week. These are just what I needed for deeper rim wheels - and it allows me to carry a spare inner tube with just one valve size (keep the valve tool with your spare tube, for use on the road).

I use these all the time and so long as you use a thread sealant you can't go wrong. Just keep in mind some valves will not work with a valve extension no matter the brand. Just keep extra valves handy

great product

These work just well enough. I had to throw some teflon tape on them to seal. Maybe they'd work better with low pressure setups or with sealant, but at road pressures with tubes, the o-ring does nothing for sealing. Otherwise, fine extender with some extra effort.

Nicely made

Not actually used yet but look to be of decent quality. I bought these as spares, one for my tool kit while I'm riding and one to keep at home in my workshop. I like the spanner as it's made from aluminium where as all the others I've seen are plastic.