ABC Permanent O-Ring

Ends leaks between cylinder and regulator
Screws into standard CO2 cylinder valve
No cylinder or regulator modifications necessary
The solution to leaky metal-on-metal or fiber washer connections between your CO2 cylinder and regulator.
Brass with O-ring insert, it threads directly into the cylinder with no modification and provides a tight, leak-proof seal.
Great option for regulators that do not have built-in o-rings
Creates a good seal to help prevent air leaks
Compatible with all Sherwood GV Series and Intermed cylinder valves
No drilling or tapping needed
This permanent O-Ring is a great option when your regulator does not have a built-in O-ring.