Coravin Sparkling System (£399) operates like this. First, you open the bottle in the normal way and pour a glass. Then you put on Coravin’s Sparkling Stopper – designed to fit any bottle neck.
A second part of the system, a Sparkling Charger, fitted with canisters of carbon dioxide, can then be applied to fill the headspace in the bottle with CO2 so that the bubbles don’t escape.
Different wines are bottled at different pressures, with prosecco at the very low end (typically around 40 PSI) while “the highest thing we found was Chandon from California at 107 PSI” says Lambrecht.
It’s a large spread and the Coravin Sparkling System is not adjustable to different pressures so it’s set in between the two extremes.
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