Introducing the 2-1/2 inch OD to 1-1/2 inch OD Reducer by POWERTEC. This shop vacuum adapter is designed to give you optimal versatility and the maneuverability of smaller vacuum attachments, with the ability to still use a bigger-sized hose. Specifically, it connects a 1.5" ID with a 2.5" ID dry wet vacuum accessories - providing you with flexibility and consistent grabbing power. 【Premium Quality】 Made with ABS plastic, this conversion unit eliminates the threat of corrosion and offers optimal impact resistance and durability for long-term use. This shop vacuum reducer is ideal for use with a variety of both wet and dry clean-up tasks, durable enough for both residential and commercial applications. 【Please Note】This fitting has a 2-1/2" OD end and is designed to fit 2-1/2" ID ports or openings, like flexible dust collection hoses. If you need to connect to a 2-1/2" OD port, an adapter like POWERTEC 70148 will be needed. The 1-1/2" OD end will fit most 1-1/2" ID ports and some 1-1/4" OD port or shop vacuum accessories. Before ordering, verify that the listed dimensions fit your shop vacuum or application.