The 4" Magport is used to quickly connect and disconnect flexible hose used in dust collection for woodworking to various woodworking machines.  The 4" Magport unit has a collar with a 4" outer diameter that fits 4" flex hose.  By installing Magport on your tools, switching between operations is quick and easy and your dust collection can keep up with your workflow.  Sold individually but requires more than one to operate.  Ships in 5 business days.