O-Ring, Permanent Seal, CO2 Tank, ABC

ABC Permanent O-Ring attaches directly to all Sherwood GV Series and Intermed cylinder valves with the internal threading on the CO2 tank valve. No drilling or tapping required.

This is not needed for TapRite or other brands of regulators with built in O-Rings on the regulator inlet stem, but replaces the need for a fiber or plastic washer for other regulators (just rember to take it off before taking a tank to a place that does swaps instead of refills).