ledovi&reg; Stainless Steel Vacuum Wine Stopper WT03 - Pump Inside - 1 Pack EASY & EFFCIENT - Pump-inside & Time-mark design help you to preserve quality wine in a super easy & smart way. SIMPLE FITTING size makes it suitable for all 750ml wine bottles and champagne with 18mm inner top diameter. A lower button position(1/8" working lowest, 1/2" initial) on the stopper would indicate the airtight vacuum has been established, air can't get in and wine won't break out. Saving wine has never been easier. PREMIUM stainless steel shell is highly durable for years perfect use. 30 days money back guarantee. Add to cart for much better easier wine saving!