Our versatile 2.5" to 4" Dust Collection Hose Reducers are designed to optimize your workshops dust extraction system. These reducers offer a seamless connection between a 2.5" dust collection hose and a 4" hose, featuring precise dimensions for compatibility: one end boasts a 2.5" outer diameter with a 2.3" inner diameter while the other end features a substantial 3.940" OD and a 3.700" ID opening, ensuring efficient airflow. Standing at an overall length of 3.5", these reducers are engineered with a flange for easy assembly and disassembly, providing convenience in your setup. Crafted from durable 1/8" thick ABS abrasion-resistant plastic, these economically priced reducers withstand the abrasive nature of wood chips and sawdust, ensuring long-lasting performance for your dust collection system. Proper grounding is recommended for all dust collection systems utilizing plastic fittings to mitigate potential static electricity buildup.