Increase your milk storage supply with the Spectra® Premium Accessory Kit with 28mm Breast Flange, Replacement Parts, and Bottle. The kit replaces your original single pumping Breast Pump parts and helps maintain the proper suction and efficiency for the S1, S2, and 9 Plus pump models. If you're needing a full (single pumping) set of replacement parts or want to have an extra set on hand for home or work, the Spectra® Premium Accessory 28mm Kit is perfect for busy moms. If double pumping, we recommend getting two kits. INCLUDES (1) Spectra® 28mm Breast Flange, (1) 5 oz. Spectra® Wide Neck Milk Bottle with the nipple, disc, cap, and cover, (1) Spectra® Backflow Protector, (1) Spectra® Duckbill Valve, (1) Spectra® Tubing CLOSED SYSTEM: The Spectra® Premium Kit aids in protecting Breast Milk and baby from bacteria, mold, and viruses while pumping. BPA/DEHP FREE: All Spectra® parts and accessories that come in contact with Breast Milk are BPA/DEHP free. RECOMMENDED: Replace parts every 3-4 months for optimal performance. 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. Single pumping replacement parts & milk storage for Spectra® S1, S2, and 9 Plus Breast Pumps One 28mm Breast Flange Included Prevents Breast Milk from contamination Increases milk flow by delivering proper suction Fridge or freezer safe milk bottle If double pumping, you'll need to purchase two 28mm Premium Accessory Kits BPA/DEHP-free materials