i72 Tubeless Valve Stems 40mm Presta Pair - Brass Made with Core Remover Tool, Round Rubber Base with O-Ring for Better Sealing

These mounted easily and had no leak issues at all.

These are better than the Stans valve stems. The extra o ring seems to help seal the rim up from air leaks. They also seem physically more robust.

Great product. Way better than the stock ones...

A much better valve than Stan’s. The oring under the nut fixes another source of leaks and keeps the nut tight.

These are working very well in my WTB i35 tubeless 2.8 set up, the rubber O-rings are a plus to get that extra seal.