The small O ring that sits between the safety valve (yellow washer) and the outside of the cap.
PLEASE NOTE: THIS IS NOT THE SAME SIZE AS THE INTERNAL O RING IN THE TOP OF S-30 VALVES.
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Rotokeg With COČ Injection System
Latstock Beer Float
Rotokeg 4 inch Spares Pack
Rotokeg 2 Inch spare washer pack
Rotokeg Oval Gasket
4 Inch O ring
Rotokeg Float Set
S-30 Replacement 4 inch Cap