21mm Replacement Accessories Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Breastpump

["Wide Application: Compatible with Spectra/Momstouch breast pump. And also compatible with AVENT Glass Natural/AVENT Natural/Dr. Brown's Natural Flow/Spectra/Maymom, and other wide-mouth bottles. Suitable for mothers with a nipple diameter of 17-19mm.","Comfortable & Effective: With the correct flange fit, it not only enhances comfort but also allows for the efficient expression of breast milk.","Premium Material: Made of food-grade plastic, soft to the touch, gentle on both moms and babies. Parents can use this with peace of mind.","Easy to Install & Remove: Molded 1:1 to the original device, ensuring complete compatibility. Plug-and-play—convenient and fast.","Simple to Clean & Caring: After each use, you may rinse them under running water, then double-clean them with steam or boiling water."]