POWERTEC 70121 Step Adapter for Wet/Dry Cleaner Internal diameters: 1-1/4-Inch, 1-1/2-Inch, and 2-1/2-Inch External diameter: 1-Inch, 1-1/4-Inch, 1-1/2-Inch and 2-Inch Flexible plastic material Fit Shop-Vac and other wet/dry vacuum cleaners