Use the 1-1/2" to 2-1/4" Adapter Fitting to connect a smaller diameter hose to your common shop vacuum. Rugged ABS material is nominal 2-1/4" O.D. on one end to slide inside the suction port on most shop vacuums and nominal 1-1/2" O.D. on the other end to connect common 1-1/2" hose or other 1-1/2" I.D. fittings.Connect common 1-1/2" hoseConnect 1-1/2" I.D. fittings About Us: Founded in Boston in 1928, Woodcraft's operations were moved to Parkersburg, West Virginia in 1989. It's been over 90 years since Woodcraft first began selling high quality woodworking tools and supplies out of a one room shop in Boston's North End, and Woodcraft is still firmly committed to providing woodworkers with superior products and expert advice. We are America’s leading supplier of saws, planes, power tools, hand tools, wood stain and paint, routers, sanding, wood, kits, dust collection and more. Our award winning family of brands includes WoodRiver, Highpoint, Woodcraft and Woodcraft Magazine as well as the greatest selection of woodworking books, videos, and plans