Winedoctor Elite Barware Kit Built-in red indicator clearly shows when to stop pumping, and if any oxygen has leaked in during wine storage. Stopper's triple o-rings create three airtight sealing points. The interior check-valve adds a fourth barrier to the threat of outside oxygen "Gentle and effective, even on the most delicate wine." Quote from Catherine Fallis, Master Sommelier. Includes: 1 Stainless Steel Vacuum Pump, 2 True Seal Intelli-Stoppers