Compatibility:Compatible with eufy Breast Pump E10 / E20 / S1 / S1 Pro. Safe Material: Our dust cover is made from food-grade plastic. Keeps the Flange Clean: Safeguards your milk from spills and contaminants with the silicone breast pump dust cover. Its snug fit ensures reliable, spill-proof protection. Universal Compatibility: Designed to fit all eufy Breast Pump models, this dust cover is a versatile and essential accessory. One-Piece Lid Design: Made from food-grade plastic, our lightweight and flexible breast pump dust cover is easy to handle and durable for repeated use. Easy to Clean: Wash with warm, soapy water and rinse well after each use. To sterilize, boil in water or steam. Guaranteed Reliability: eufy breast pump accessories are covered by a 90-day limited manufacturer's warranty. Lifespan: Typically lasts 6 months. Replace if suction and performance decrease with use and sterilization, or based on your usage.