Contents: 6*duckbill valve with a longer service life and greater durability Breast Pump Compatibility: Difking duckbill valve compatible with Spectra S1, S2, 9 Plus, and Synergy Gold electric breast pumps.Not Original Spectra Pump Parts Pump Part for Baby Feeding: This breastfeeding support part is designed to replace your breast pump's duckbill valve every 3 to 6 months. Same suction power as OEM valves Made without BPA: Like all other DIFKING breast pump parts and accessories that come into contact with breast milk, our duckbill valve is made without BPA and are instead made with food-grade silicone Clean and Sanitize: Dishwasher toprack safe. Can be sanitized with water steam, boiling water or microwave-steam bags.The parts should be washed and sanitized prior to first use. They should continue to be washed after each use and sanitized once daily