Hegen'S Breast Pump Adapters Allow You To Express Directly Into Hegen Bottles. Express, Store, And Feed Within A Single Container With No Wasteful Transfer Of Milk Necessary! Simply Swap Adapters With Our Storage Lids Or Feeding Collars To Store Or Feed. Hegen Breast Pump Adapters Are Compatible With Most Leading Electric And Manual Breast Pumps On The Market. Make Every Drop Count With Hegen.Hegen'S Breast Pump Adapters Are Not Compatible With The Medela Flex And Pigeon Go Mini Pumps. For More Questions About Breast Pump Compatibility, Please Reach Out To Us Via The Live Chat At The Bottom Of The Page.Hegen Pcto™ Wide Neck Adapters Have A Diameter Of 4.8Cm And Will Allow You To Adapt Your Breast Pump To Hegen Bottles.Do Note That Different Breast Pump Bodies/Shields/Flanges Differ In Opening Size And You Should Check And Match Accordingly. •Compatible With Most Electric And Manual Wide Neck Breast Pumps. •Express, Store And Feed Within A Single Container With Interchangeable Wide/Standard Adapters, Storage And Feeding Lids. No Wasteful Transfer Of Milk, Making Every Drop Count. •Organise Smartly With Snap-On Interconnecting Storage Lids, Enhancing Stability And Allowing Multiple Containers To Bind Together Effortlessly. •Easily Stackable When Filled, Optimizing Storage Space On-The-Go Or At Home, The Practical Soft-Square Bottle Design Also Nestles Together Neatly When Empty. •Air-Tight And Leak-Proof Storage Lids Minimises The Oxidation Of Precious Nutrients In Breast Milk And Keeps It Fresh. •Growing With Your Baby, The Storage Containers Can Also Be Used As A Snack Cup Or To Store Baby Food, Semi-Solids, Puree, Biscuits, Fruits Or Even Juices!