POWERTEC 70133-P6V 2-1/2-Inch Blast Gate for Dust Collector, Dust Collection Fittings, 6 PKINCLUDES: (6) 2 1 2 Blast Gates; Both ends have 2 1 2 OD outlet diameters and are designed to work with 2 1 2 ID dust hoses or other 2 1 2 ID ports FUNCTION: Maximize the efficiency of your dust collection system by directing and regulating airflow from one engine to another QUALITY: Made with premium black ABS plastic, this unit is designed for durability and abrasion resistance able to withstand the everyday wear and tear of dirt, sawdust and wood