Introducing the 4 in. Aluminum Blast Gate by POWERTEC. This must-have dust collector attachment helps maximize your dust collector system by regulating proper air flow to your designated machine of choice. Open and closed, it acts as an in-line gate to control the vacuum flow to specified areas of your workshop. Additionally, this aluminum blast gate works seamlessly with properly sized plastic and metal ducts, flexible hoses, and 4 in. ports for an assortment of popular brands. Self-Cleaning Unlike other models that require constant attention, this unit possesses a self-cleaning gate (open slot) at the back that allows for clog-free operation. It also possesses a built-in stop that keeps the gate exactly where you need it during operation. When properly used, this self-cleaning blast gate not only helps eliminate constant maintenance from jamming but also prevents air leakage that would otherwise disrupt your workflow. Premium Construction Our Blast Gate features a solid aluminum body with a highly durable stainless steel gate - providing a more long-term and durable solution to plastic versions. Universal Fit Featuring a nominal 4 in. O.D., this unit will provide a perfect fit for most professional and at-home workshop dust collection systems. Whether you're a beginner or a seasoned woodworker, it's extremely easy to use and install.