Diffused external exhaust air guide ensures flexible working Diffused external exhaust air guide ensures flexible working2-in-1 hose and IAS interface are easy to use and save time when changing toolsRotating adapter ensures smooth, rapid working progress and saves timeAnti-static properties help prevent buildup of dust inside hoseFestool IAS 3-Light AS Hoses is an anti-static hose for use with all Festool tools. This hose is designed for connecting a Festool compressed air sander to a Festool mobile dust extractor or energy box.