The small Haakaa flower closes all models of Haakaa breastpumps, thus protecting all the valuable properties of breast milk and preventing milk from being emptied. Features Made from 100% silicone. Compatible with all three generations of Haakaa breastpumps. Prevents accidental emptying of valuable breast milk. Protects all the good properties of breast milk. Cleaning and care: Clean after each use. Can be sterilized either in a steam sterilizer or by boiling in hot water for 2-3 minutes. Do not use bleach for cleaning. Warning: Check regularly that the product is intact and replace it if it shows any signs of damage. This is not a toy. Use the product only for its intended purpose. Children may choke on small objects. Use only under adult supervision. Store in a cool, dry place, out of direct sunlight. The Haakaa flower caps are patented.