There is a bearing lock/unlock device on the adapter ring of DWV9000. You need to screw it to the unlocked position before you can slide it into the dustproof port.
Compatible with DEWALT Dust Extractors£¬Vacuum hose, for Various DW tools & shrouds.
Dust collection with tools for concrete, drywall, or woodworking applications
Allows fits quick, easy connection between 1-1/4 In
