From my kite repair business:
I've been replacing valves from RRD and Ozone veeery often.
Be aware: that valves doesn't last long and crack.
Ozone and RRD 2018, 2019 (and maybe newer). Different valves but same problem.
Ozone has warranty for most of people that claims for it. They even sent me a new bladder pack for reo 7m and 9m.
The valve gets older faster than the normal and crack.
RRD sold me a big quantity of replacement valves but I don't know if the new ones have a better quality or not (we would have to wait a couple years to know).
Is the problem solved now? We hope!