The adapters (2 pc in the box) allow you to pump directly into most popular breastmilk storage bags like Youha, Medela, Spectra, Avent, Unimom and Cimilre
 
No milk loss due to transferring from collection bottles to bags
Fits most wide neck breastshields (YOUHA, Avent, Spectra wide mouth flanges) 
Fits most narrow neck breastshields (Spectra narrow mouth flanges)
 
Material: 
Polypropylene(PP) and Stainless steel spring
Free of BPA, BPS, Phthalates and PVC
 
NOTE: There is stainless steel in the product. DO NOT place the product in a microwave oven or steamer bag for sterilization. Use boiling water for 2-3 min instead. DO NOT hold the clip area when you are pumping to avoid release of the bag, thus dropping the milk on the floor! 
 
Wide Neck Adapter is compatible for YOUHA, AVENT, Spectra (Wide Neck) 
 
Narrow Neck Adpater is compatible for Spectra (Narrow Neck) (NOTE : Medela models are not compatible)