Pump with Confidence! 💪 Crafted from BPA-free materials, ensuring a safe pumping experience. Compatible with steam, boiling water, and microwave-steam bags for hassle-free cleaning. Quality assured with rigorous safety testing for peace of mind. Seamlessly compatible with Spectra S1, S2, and 9 Plus breast pumps. Choose from a range of flange sizes (19mm to 30mm) for your comfort. 2 Flanges BPA Free Compatible Parts The Nenesupply 21mm 2 pc Flanges are aftermarket replacements designed for Spectra S1, S2, and 9 Plus breast pumps. Made from BPA-free materials, these flanges ensure safety and comfort while maintaining the same suction power as original parts. With easy sanitization options and a variety of sizes available, they are the perfect choice for modern moms seeking reliability and convenience.