Rheem RTG20151R 3-Inch-5-Inch Concentric 12-Inch Vent Length<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>12-Inch overall length</li><li>For 3-Inch- 5-Inch Concentric Tankless Venting</li><li>Manufactured by Metal Fab， Inc.</li><li>Not compatible with components manufactured by Heat-Fab</li></ul></div><img src="http://ecx.images-amazon.com/images/I/313X6iOD0bL.jpg" noproxy>