Fill from the top and dispense from the bottom. InvertaTop™ squeeze bottles soft, leak-proof 'PerfectFlex' design is operator friendly while reducing waste and ensuring faster food prep. The valve design works with a variety of both low viscosities, fast-flowing liquids such as olive oil & vinegar as well as high viscosity, slow-flowing condiments such as barbeque and mayonnaise. In addition, the valve easily dispenses chunky sauces such as Thousand Island dressing and tartar sauce! Any sauce with up to 3.2mm particulates.