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Package includes 2 x return guards (including 2 large caps, 2 small caps and 2 membranes) and 6 x duckbill valves; Maymom return guards can replace newer and older versions of Spectra return guards; Maymom valves can replace Spectra duckbill valves Compatible with Spectra S1, S2 and 9 Plus breast pumps; Duckbill valves are also compatible with Spectra Dew 350; compatible accessories not original; also fit Ameda Mya Portable and Ameda Mya Pro pumps Equivalent suction performance: valves compatible with Spectra and Maymom nipples; return guard compatible with Spectra and Maymom tubes to optimize pulling performance Closed system: with Maymom return guards, milk does not enter the tube, which helps to keep the tube clean; can be cleaned with steam or boiling water Materials comply with FDA (US), Canada, Australia and EU regulations for medical devices and food contact; Tested by independent laboratories, reports available; BPA free; Retail packaging, sealed by manufacturer Maymom