Youha Valves The Ins Gen 2 is a pair of duckbill replacement valves for Youha The Ins Gen 2 Wearable Handsfree Breast Pump . Made of safe food grade silicone. It is ideal to replace your valves every 2 months, and less if you pump frequently. Replacing your valves frequently is essential in keeping your breast pump working in top condition for best pumping experience. ForYouha The Ins Gen 2 Wearable Handsfree Breast Pump (click here). Contains 2x valve only.