Connect most 4” dust collection hoses to common 4” DWV PVC pipe Left-hand threaded 4” end fits inside most 4” dust collection hoses Smooth smaller diameter end slides inside most 4” DWV PVC pipe Smooth side outside diameter approximately 4.000 inches - ABS material for rigidity and durability WoodRiver is proudly made by Woodcraft, America’s leading supplier of high-quality woodworking hand tools, power tools, domestic and exotic wood, shop supplies, project plans and kits, plus so much more! Offering first-rate products for all your woodworking needs and designed to help you make wood work. Our family of brands include Woodcraft tools and supplies, Highpoint professional-grade fasteners and hardware, Pinnacle precision-engineered tools and Woodcraft Magazine. This unique WoodRiverDust ConnectionAdapter allows you to utilize commonly available 4" sewer and drain pipe found in most home centers to construct your own dust collection duct and transition to 4" hose for machine connections. This adapter fitting fits on the inside of 4" sewer and drain pipe with a 4.065" ID. Pipe marked as manufactured to standard ASTM D2729 is suitable for use with this adapter. Adapter works with left-hand threaded dust collection hose only. Adapts 4" Sewer and Drain Pipe to 4" left-hand threaded Dust Collection Hose. Molded from ABS plastic material for rigidity and durability. 
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, hand planes, power tools, hand tools, wood stain and finishes, routers, sanding supplies, wood, wood turning project kits, dust collection, and wood carving tools. We also offer a wide selection of woodworking plans, books and videos. Our family of brands includes WoodRiver, Highpoint, Woodcraft, Pinnacle and Woodcraft Magazine.