Silicone Diaphragms (FOR FLANGES ONLY)
Diaphragms (also known as backflow protectors) keep milk and air from flowing back up the tubing. They prevent milk from getting into the breast pump motor and also keep your tubing as clean as possible.
Replace your silicone diaphragm every 8-9 weeks. It's crucial to replace it frequently especially if you use your pump multiple times per day.