Medela Pump in Style replacement tubing is made for use specifically with your Pump in Style Advanced breast pump, including the On-the-Go Tote, Backpack, and Metro Bag models. While it provides the best compatibility with all Pump in Style Advanced breast pumps manufactured after July 2006, the replacement tubing also works with the Pump in Style Original - which is now considered obsolete. Having extra tubing on hand ensures that you always have clean breast pump parts available and ready to use whenever needed, or it can be used as a seamless, easy replacement for damaged or worn tubing. As an authentic spare part, the Medela Pump in Style replacement tubing is engineered, tested, and approved to work specifically with your Medela breast pump. Because inauthentic or counterfeit spare parts can vary drastically in terms of quality, materials used, and overall workmanship, using inauthentic spare parts may affect the performance of your Pump in Style Advanced breast pump. All Medela accessories and breast pump parts that come in contact with breast milk are made without BPA, so you can continue feeding your little one with breast milk for as long as you choose and with the peace of mind you deserve. Inspect tubing after each pumping session. Tubing should be washed if dirty or milk is present. Cleaning tubing is NOT necessary if condensation inside the tube is from previous washings or atmospheric conditions