BikeShop - Orange Seal Versa Valve Tubeless Valve Stem, Pair

What they say:

The VersaValve stem utilizes a large, sturdy base plate that can be fitted on different rims, by use of rubber grommets. The large base plate ensures a solid contact with the rim bed and the adaptable grommets guarantee an airtight fit on most rims for mountain, road or CX use.

• Universal fit. One valve for all rim types
• Replaceable grommets
• Kit includes VersaValve stems, two types of grommet, extra valve cores and RVC tool