Replacement Parts for Medela Harmony Manual Pump; 4 O-rings， 2 Membranes by Maymom<div style="text-align: left;"><strong>[Product Information]</strong><ul><li class="showHiddenFeatureBullets"><span class="a-list-item"> Replacement O-ring for your Medela Harmony pump plus two membranes </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> BPA free </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> 4 o-rings and 2 membranes </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41udKqnnlgL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41xhkmitpML.jpg" noproxy>