Dr. Brown's Customflow Double Electric Breast Pump Replacement Parts Kit makes pumping more convenient than ever for moms on the go. Replacement parts don't just have to be used when something is missing or damaged – having an extra set means you'll always have clean parts on hand. Kit includes 2 Pump Connectors, 2 Membranes, 2 Membrane Caps, 2 Duckbill Valves and 2 Tubes. Keep an extra set in the car or at work and you will always be prepared. Replacement flanges sold separately and available in multiple sizes.