Hayward SP1072S 1-1/2-Inch Slip In-Line Backwash Sight Glass<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Backwash sight glass</li><li>Made of ABS plastic material</li><li>Used in installations where the backwash effluent is not visible from the filter</li><li>Designed to use for 2-inch valve</li><li>Measures 1-1/2-inch slip</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41uQu3cOJTL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31ZYPKumTEL.jpg" noproxy>