Theae replacement VENT INSERT are exclusively for the WIDE-NECK 120ml and 240ml.DR BROWN'S natural flow baby bottle.These are the same exact pieces that come with each WIDE-NECK 120ml and 240ml DR BROWN'S natural flow baby bottle and are meat to replace worn or lost insert.These VENT INSERT are an integral part of the DR BROWN'S patented internal venting system,and they work only with the WIDE-NECK 120ml and 240ml DR BROWN'S natural flow baby bottle.If you need to replace the entire venting system for your DR BROWN'S natural flow baby botlle,you will also need DR BROWN'S replacement VENT RESERVOIRS.
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