The Spectra SG Synergy Gold 28mm Premium Accessory Kit is the premier pumping kit for increasing milk storage supply. The 28mm SG premium kit replaces all Spectra SG Dual Powered Double Electric breast pump parts and helps maintain proper suction and efficiency for more productive pumping sessions. If you're 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 are to be replaced every 3-4 months for optimal performance. The Spectra SG Premium Accessory Kit contains one 28mm breast flange, one 5oz Spectra milk bottle with lid, disc, and cap, one backflow protector, one duckbill valve, one tubing, and one tubing and 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. Replacement accessories for the Spectra SG Dual Powered Double Electric breast pump Specifically designed and manufactured to provide proper suction for over 15 control settings Double layered closed-system keeps breastmilk away from the pump motor All parts are dishwasher safe BPA/DEHP-free materials Includes SG pump tubing and adapter end parts designed specifically for the independently controlled motors Premium Spectra Synergy Gold label 5oz milk bottle included