Enhance your Breast Pumping sessions with the Spectra® 20mm Breast Pump Flange Set. The 4pc set replaces your original pumping parts for single pumping. Perfect to have on hand as extra parts at home or office, the Spectra® 20mm Breast Pump Flange Set helps obtain proper suction while maximizing the optimum performance of your Breast Pump. Safe for mom and baby - the 20mm Breast Pump Flange Set is specifically designed for Spectra® Breast Pumps and made with BPA-free materials. The set features a backflow protector to stop Breast Milk from backing up into the pump motor, keeping your milk free of contamination. If double pumping, you'll require purchasing two 20mm Breast Flange Sets. We recommend replacing your parts every 3-4 months for optimal use. INCLUDED: (1) Spectra® 20mm Breast Flange, (1) Spectra® Backflow Protector, (1) Spectra® Duckbill Valve, (1) Spectra® Tubing BPA/DEHP FREE: All Spectra® parts and accessories that come in contact with Breast Milk are BPA/DEHP-free. 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 for Spectra® S1, S2, and 9 Plus Breast Pumps One 20mm Breast Flange Included in 4pc set Prevents Breast Milk from contamination Increases milk flow by delivering proper suction If double pumping, you'll need to purchase two 20mm Breast Flange Sets BPA/DEHP-free materials