Originally Posted by obrentharris

I'm sure a presta valve with a rubber stem must exist somewhere but I've never seen it. All the presta tubes I've used have metal stems so the point about the grommet protecting the presta stem from cuts is moot. Better make sure that a presta valve with grommet will even work for tubeless since the nut that holds the valve in place would compress the grommet causing it to deform.
Brent