Set of Four Stoppers for Vacuum Wine Pump - Designed for Pump-and-stopper vacuum system. - Easier pumping action. - Includes four Push-Button Stoppers. - Patented valve holds a vacuum for days. - Size: 1.5 x 1.5-in. Push-Button Stoppers are for use with Rabbit Lever Vacuum Pumps and Save-The-Wine Vacuum Pumps. Vacuum can be released at the touch of a button. Bottles sealed with Push-Button Stoppers can be stored horizontally without leakage (which can occur with competing pumps). Metrokane was founded in 1983 by Riki Kane who had been an advertising copywriter and a syndicated journalist, creator of the popular newspaper word game, "Wordy Gurdy." While traveling in Mexico, she purchased a manual citrus juicer, which she brought home to squeeze her morning orange juice. She was surprised to find that manual juicers had been extinct in the U.S. since the advent of electric citrus juicers in the '50's. Convinced that the manual juicer is superior to the electric kind, she re-introduced it to the American market with a classic retro design called "The Mighty OJ." Metrokane's Mighty OJ Juicer was an immediate success in department and specialty stores around the country. Initially, Ms. Kane ran the business from her apartment -- expanding her line of juicers and fighting a long, but ultimately successful legal battle against Mighty OJ imitations (called "knock-offs" in the industry).