Introducing the 4” to 2-1/2” Cone Reducer by POWERTEC. This limited adapter was designed to provide you with a simple solution to coupling your 4-inch ID dust hoses with 2-1/2 ID dust hoses. Specifically, it allows you to step down from a larger main line to a smaller branch line without compromising air velocity or the effectiveness of your dust collection system. It features a premium, heavy walled ABS plastic construction made for durability and to withstand the wear & tear commonly associated with woodworking dust collection. It's extremely easy-to-use and doesn't require messy tape or additional equipment. “Make a clean and smart connection today with the POWERTEC Cone Reducer.” PLEASE NOTE: This reducer is NOT intended to be used for a direct connection to your dust collector OD ports. It fits and accommodates hoses ONLY. If you are in need of an adapter that connects directly to your 4” dust collection equipment port, you will also require the following item: POWERTEC 70149 4” Flex Cuff with Hose Clamp (sold separately) To make a direct connection between a 4” port to another 4” port, the following adapter may be a better alternative: POWERTEC 70171 Threaded Quick Coupler (sold separately) POWERTEC is a leading manufacturer of high quality woodworking tools and accessories, machines, and an assortment of OEM replacement parts. We are committed to exceeding expectations, while bringing the latest innovations, technology, and product development to the industry.