POWERTEC 70135 4-Inch Aluminum Blast Gate for Vacuum/Dust Collector<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Maximizes the efficiency of dust collection system by directly the air flow from one machine to another</li><li>4-Inch outlet diameter</li><li>Easy sliding gate action saves your effort and time</li><li>Aluminum construction with Steel Gate</li></ul></div><img src="http://ecx.images-amazon.com/images/I/4155WQ3tULL.jpg" noproxy>