If youre building a dust extraction system, you need the right parts and connectors. The Makita® Vacuum Hose Y-Adapter allows for the connection of two power tools into a Makita® 11 Gallon Wet/Dry HEPA Filter Dust Extractor/Vacuum (VC4210 and VC4710, sold separately). This eliminates the need to switch between two tools from an on-board power outlet. It threads on quickly for easy installation. The adapter is engineered with high quality materials for long service life.