Maymom Duckbill Valves for Spectra. Designed for Spectra S1 Spectra S2 Spectra 9 Plus Spectra Dew 350 Not Original Spectra Pump Parts Spectra S2 Accessories Replace Spectra Valve (6 ct White) is a Baby & Kids Feeding option for everyday use, business supply needs, resale shelves, or household stocking. Review product size, pack count, and shipping details before checkout.