The adapters (2 pc in this listing) allow you to pump directly into most popular breastmilk storage bags like Lansinoh and Nuk.
No milk loss due to transferring from collection bottles to bags
Fits most wide neck breastshields (Avent, Spectra S1/S2 wide mouth flanges);
Material: Heavy duty polypropylene(PP), BPA free. Stainless steel spring.
NOTE: DO NOT place the product in microwave oven for sterilization. Use boiling water instead. DO NOT hold the clip area when you are pumping to avoid release of the bag, thus dropping the milk on the floor!