Compatibility:Compatible with eufy Breast Pump E10 / E20 / S1 / S1 Pro. Food-Grade Silicone: Made from food-grade silicone, the diaphragm is safe for both mother and baby and durable for repeated use and sterilization. Flexible and Durable: The silicone material offers the flexibility needed to maintain a steady suction while being robust enough to withstand wear and tear over time. Easy to Clean: The smooth surface allows for effortless cleaning and sterilization. Guaranteed Reliability: eufy breast pump accessories are covered by a 90-day limited manufacturer's warranty. Lifespan: Typically lasts 1-3 months. Replace if suction and performance decrease with use and sterilization, or based on your usage.