Endorsed by some of the country's best-known wine critics, this system uses 100% inert gas (non-toxic) to remove all of the oxygen from your opened bottle. Preserve your wine's freshness in 4 easy steps. 1) Insert included tube securely into nozzle with a twisting motion. 2) Place the tip of the tube into the neck of the bottle midway down and against the glass. 3) Have cork or stopper ready on top of bottle resting against the tube. 4) Spray for 1/2 of a second and then 4 shorter bursts, both quickly pull the tube out and insert cork or stopper into the bottle. An amazing 120-plus uses in 1 can.