Authentic Momcozy 27mm single-sealed flange accessories, designed for S9 Pro/S12 Pro wearable breast pumps. Made of BPA-free, food-grade silicone for safe milk expression. Easy to clean with warm soapy water or boiling water/steam. FSA/HSA eligible. Ensure optimal comfort and efficiency by selecting the correct flange size. Replace parts every 1–3 months or if deformed/yellowed. Made by moms, for moms, supporting hassle-free pumping anytime, anywhere.