INCLUDES: (1) 2-1/2-Inch to 1-1/2-Inch Adapter for Shop Vacuum Accessories FUNCTION: Connects 1-1/2” ID and 2-1/2” ID dry/wet vac hoses or ports; Adaptable to a variety of shop vacuum cleaners but will not work in all applications. Before ordering, verify that the listed dimensions fit your shop vacuum and application. VERSATILE: Gives you the ability to use large size accessories and provides added adaptability by providing a wider range of available woodworking tools and dust collection options PREMIUM: Features a black, ABS plastic construction with optimal durability for long-term use, corrosion resistance and is impact resistance for wear and tear DIMENSIONS: 1-1/2-Inch nominal end measures 1-15/32-Inch O. D. and 1-1/4-Inch I. D.; 2-1/2-Inch nominal end measures 2-1/2-Inch O. D. and 2-1/4-Inch I. D..Connect a 2-1/2-Inch hose or accessory to a 1-1/2-Inch hose.Tough, durable ABS plastic material.Adaptable to Shop-Vac, Sears and a variety of other wet/dry vacuum cleaners.2-1/2-Inch nominal end measures 2-15/32-Inch O.D. and 2-1/4-Inch I.D..1-1/2-Inch nominal end measures 1-15/32-Inch O.D. and 1-1/4-Inch I.D., Manufacturer: Southern Technology LLC