ResMed S9 CPAP Hypo-Allergenic Filter， 2pk by Sunset Medical<div style="text-align: left;"><strong>[Product Information]</strong><ul><li class="showHiddenFeatureBullets"><span class="a-list-item"> Superior Quality and Filtration </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Fits the ResMed S9 platform only </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Dimension 2 1/8” x 1 7/16" </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Hypo-Allergenic Ultra Fine Filter </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31sCZn-iKFL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/21gEQihD%2BTL.jpg" noproxy>