Replacing your breast pump parts is vital to maintaining the effectiveness of your Twist Breast Pump. The Twist valves attach to the underside of the breast shield to provide a seal and ensure breast milk flows properly into the containers while pumping. We recommend having extra valves on hand for flexibility. Replacing your pump parts approximately every 90 days will ensure your Twist is working at peak performance.
 
Includes: 2 valves, 2 membranes