Evanix ar6 fill valve o-ring size?

[vanTeunenbroek]

When filling my ar6 the last time i opened the bottle to fast and damaged the o-ring in My fillvalve.
The Old ring was very brittle so broke up in several pieces upon removal.
Does anyone know what size o-ring goes into the fillvalve (the small ring inside the valve that seals the airtube) or maybe a complete o-ring chart for the ar6 
Thanks Benji