M18-V Part Number 218, aka NDRS Part Number XDRS02-18 :

AIR HOSE -Part#218 is 8mmOD plastic airline hose that connects from the upper arm to the bellows typically found on older saws. XDRS02-18 is a 10mmOD hose connects to the bellows or vacuum funnel for the new Saw Dust Management System.  Chose from the pull down menu.