The Haakaa Silicone Flower Stopper sits tight in the neck of your breast pump to preserve the beneficial properties of breast milk while preventing any accidental spills. Made from 100% silicone, our flower stopper is compatible with all generations of Haakaa breast pumps. Features Made from 100% silicone. Compatible with all three generations of Haakaa Breast Pumps Prevents accidental spills. Preserves the beneficial properties of breast milk. Cleaning and CareClean after each use. This product can be sterilized with any steam sterilizing system or by boiling in water for 2-3 minutes. Do not use bleach-based agents to clean this product.Caution: Check product condition regularly - replace if this product shows any signs of damage. Infants are to be supervised at all times while using this product. Please do not use this product for anything other than its intended use.