1. Adopt an Auto Flip cap that keeps closed when the bottle stands upright, and automatically opens when you pour. 2. Stainless steel construction is corrosion-resistant, durable, rust-free, and easy to clean. 3. TPE plug ensures airtightness and leakproof when you pour the liquor. 4. Pourers provide fast and consistent liquid flow and convenient one-hand operation. 5. Work on 17-21mm bottle mouth, such as wine bottles, whiskey bottles, olive oil bottles, vinegar bottles and other seasoning bottles.