Joovy Boob CleanFlow Vents， Grey， 2 Count<div style="text-align: left;"><strong>[Product Information]</strong><ul><li class="showHiddenFeatureBullets"><span class="a-list-item"> Proper venting is critical in preventing vacuum effects and reduces air intake by your baby </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> The unique design has 4 lock notches that fit perfectly into the bottle's neck， eliminating over and under tightening which can cause leaks and/or inconsistent liquid flow </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> The vent ring is made from hard PPSU plastic that is co-molded with a soft silicone vent sleeve </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> This unique， one-piece design allows assembly while only touching the hard vent ring， keeping the silicone vent sleeve that comes into contact with the feeding liquids away from unsterilized hands </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41iewkKZ%2BLL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/21dpPRTAAEL.jpg" noproxy>