24 oz NSF InvertaTop Standard, ValveTop 63mm opening. Dispensing made easy. Unique design, sanitation guaranteed. Fill and store inverted for quick and easy use. Dual openings easy to clean and fill. FDA approved food grade polyethylene material. Leakproof soft polyethylene PerfectFlex for fast prep. Design works well with olive oil and vinegar and high viscosity, slow flowing condiments such as bar b que sauce and mayonnaise.