The perfect little accessory for your Haakaa silicone breast pump! The silicone stopper! This little stopper sits tight in the neck of your Haakaa breast pump and will stop any spills or accidents. Made from 100% food grade silicone and will fit in both 4 oz (100 ml) and 5 oz(150 ml) size breast pump. Clean after each use. This product can be sterilized with any steam sterilizing system or boiling water. No bleach based agents. Warning: Children can choke on small objects if left unattended. This product is not a toy and must be used under adult supervision.