<p>FUNCTION: This dust collector attachment possesses a 4-inch OD end that connects to standard 4-inch ID dust collection hose and allows you to step down to a 3 inch dust collection hose or line branch. Note: to connect to other 4inch OD ports or adapters, a 4inch flex cuff</p> <p>EASY TO USE: Offers a 4inch OD profile with tapered port on one side, fits inside most 3inch dust collection hose</p> <p>PREMIUM QUALITY: Made with heavy duty plastic material for long-term durability and made to withstand the abrasive nature of woodworking and workshop dust collection</p> <p>DIMENSIONS: 4-Inch o.d nominal end to 3-Inch o.d nominal end</p> <p>Connect 3-Inch opening duct to 4-Inch flexible hose</p> <p>Transition 3-Inch duct to 4-Inch standard hose</p> <p>Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you!</p> <p>Colour:As Shown</p> <p>Material:plastic</p> <p>Package Contents:</p> <p>1 x 4 inch to 3 inch dust collection reducer</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>