Increase your milk storage supply with the Spectra SG Synergy Gold 24mm Premium Accessory Kit. The 24mm SG premium kit replaces all Spectra SG Dual Powered Double Electric breast pump parts and helps maintain the proper suction and efficiency needed for productive pumping. If your needing a full set of replacement parts or want to have an extra set on hand for home or work, the Spectra SG Premium Accessory Kit is perfect for busy moms. If double pumping, we recommend getting two kits. All Spectra replacement parts are BPA/DEHP-free and must be replaced every 3-4 months for optimal performance. The Spectra SG Premium Accessory Kit contains one 24mm breast flange, one 5oz Spectra milk bottle with lid, disc, and cap, one backflow protector, one duckbill valve, one tubing, and one tubing with adapter end with instructions. If you have questions or issues with any Spectra product, please reach out to our Customer Care team before contacting your original place of purchase. We will happily assist anyone with all questions at 1-855-405-0993.