Introducing the 4 in. OD Inlet Flange Connector by POWERTECH. This versatile accessory comes in handy for a wide range of professional workshop and at-home DIY projects that requires a 4 in. 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. Multi-Functional Design The connector features a tapered port which connects into 4 in. ID dust-collection hose and other applicable fittings, such as quick connect or hose end fittings, etc. It comes with pre-bored mounting holes for a hassle free installation. Convenient, durable and multi-functional, this handy dust collection accessory will help to ensure that your dust-collector is working at peak efficiency and effectiveness.