Answer: Fillmore valve 1mm internal passage is self-evidently too small for a sealant with a larger particle size.Hmmm? I wonder how it’s clogging up then? Smallish passage, internal mechanisms?
I’ve never had success with injecting some sealants through the Filmore valve. After 10-20ml it clogs up. Now I just pour 80-100ml of sealant directly into the tire (1 bead off).
I really thought it was a spring but I guess the psi keeps the plunger valve closed.![]()
Being required to pour sealant directly into a bead-off tyre in order to get around a Fillmore valve design problem is taking the piss. Not for me, as said before it's back to Presta valves, at least the cores can be easily removed.





