nenesupply caps lids compatible with spectra bottles avent bottles and nenesupply bottles replace spectra bottle cap avent bottle cap wide neck bottle cap compatible with spectra pump parts spectra s2 nenesupply this product is design to seal avent natrual polypropylene bottles and nenesupply wide-neck bottles. it does not work with avent classic bottles, avent glass bottles and avent via cups. this cap can replace avent natrual screw ring and sealing disc. one-piece design, easier to store, and less parts to clean. every cap is enclosed with silicon sealing ring, and is leak-proof. made from bpa free materials, and can be sanitized with boiling water or water steam.