This manual blast gate helps maximize your dust collection system by regulating proper air flow to your designated machine of choice. Acting as an in-line gate to control the vacuum flow to specified areas of your work shop, it's designed to work seamlessly with a variety of flexible hoses, ducts and 4 in. ports for an assortment of popular brands. ✔Universal Fit -Featuring a nominal 4 inch OD diameter, this unit will provide a perfect fit for most professional and at-home workshop dust collection systems. Whether you're a beginner or seasoned woodworker, it's extremely easy to use and install. The 4 in. x 20-foot PVC Dust Collector Hose - POWERTEC 70143. A practical, safe and cost effective dust collection hose designed to enhance your existing workshop dust collection and filtration systems. ✔Flexible Versatility: Whether you have an industrial vacuum cleaner or a centralized dust collection system built into your shop, you understand the importance of having a super lightweight, flexible and kink-proof dust collection hose that can withstand the rigors of everyday shop use. ✔Innovative Design: Features Flaunts an impressively translucent body, reinforced by interior spiral spring steel wire allowing you to monitor your air movement performance, debris collection and fine dust separation/ filtration.