Willow Pump’s transparent flanges make putting Willow on a breeze. Load a spill-proof Milk Bag inside your flange, connect the Willow Pump, and move on to what’s next on your list. When you’re finished, pop the flanges into the dishwasher to clean. BPA free & dishwasher safe. Exclusively for use with the Willow Wearable Breast Pump Generations 2 and 3. 90-day limited manufacturer’s warranty.