Youha Connectors for Express PLUS & The INs Gen 1 Handsfree Breast Pump is a replacement connector that is compatible with Youha The One Express PLUS Collection Cup Set and Youha the Ins Gen 1. It is ideal to replace your connectors every 6 months or as needed. Replacing your breast pump parts frequently is essential in keeping your breast pump working in top condition for best pumping experience. Includes 2 x membrane + 2 x valve base + 2 x connector