Cuff (Swivel version) - for connecting 1 1/2" (36mm) oil resistant
hose to any Alto/Wap, Festool or Fein vacuum. Threads onto the
hose ribs (reverse thread). External diameter for the part that
plugs into the vacuum is 2 9/32" (58mm).
Note - for coupling hoses,
you'll need to use one of these couplers at either end of the
primary hose and a Coupler Sleeve.