Introducing the 4-Inch OD Inlet Flange Connector by POWERTEC. This versatile accessory comes in handy for a wide range of professional workshop and at-home DIY projects that requires a 4" ID port to fitting connection. It's duct flange design provides a quick and seamless attachment to machines, inline extractor fan and dust collector systems. However, it's rigid ABS plastic construction can stand up to the abrasive nature of wood chips and debris commonly associated with dust extraction and those same characteristics also make it ideal for a variety of ducting and ventilation applications.