From Reserve: 

Reserve has rewritten the future of tubeless systems with the introduction of the all-new Fillmore valve, a completely new take on tubeless valve designs. The patented Fillmore valve represents a game-changing leap forward in technology, with a high-flow design that eases tubeless set up and eliminates the traditional, delicate, clog-inciting valve core of yesteryear.

High Flow: 3X air flow makes seating tires a snap
No Clog: Eliminates clogging and busts through dry sealant
Micro-Adjust: Airs down to the perfectly dialed tire pressure
Direct-Inject: Coreless design for no-fuss injection of sealant