Zoeller 30-0021<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Prevents back flow of water and sewer gas</li><li>Full flow</li><li>Extra wide flapper hinge prevents hinge stress</li><li>Vertical or horizontal line</li><li>Slips over ABS， PVC， steel or copper pipe</li></ul></div><img src="http://ecx.images-amazon.com/images/I/312mzZ238ML.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/21QHBMDNO8L.jpg" noproxy>