The Olababy GentleBottle Breast Pump Adapter (for Medela Pump 2PK) is part of the Olababy bottle feeding system. Our adapter pairs with the Spectra S1 and S2 breast pumps. It helps moms to pump breastmilk directly into the GentleBottle, reducing the risk of contamination and milk-loss from multiple transfers such as from pump to storage to bottle. Our adapters are made with high grade PP material that is BPA free. It is easy to use and dishwasher safe.