Spectra CaraCups Backflow Protector Replacement Kit Kids Clear NWT 4pc MM012380 Spectra CaraCups backflow protector replacement kit includes four pieces to maintain your breast pump's performance and hygiene. Designed specifically for use with the CaraCups wearable milk collection system, these components prevent milk from entering the pump motor, ensuring a closed system. The kit contains two backflow caps and two backflow membranes, all made from BPA-free materials for safety and peace of mind. Essential for regular maintenance, these authentic Spectra parts are easy to assemble and clean, helping to preserve suction strength and prevent contamination.