POWERTEC 4 in. to 2-1/2 in. Dust Collection Splitter Fitting 70276 - The Home Depot
Amazon.com: POWERTEC 70275V 3-Way Dust Collection Fitting for 4 in Hose & Cuff, 1 PK,Black : Tools & Home Improvement
Y Fittings | Dust Collection | Peachtree Woodworking Supply
Amazon.com: 4 to 2-1/2 Inches 3 Way Y Connector with Openings OD 3-15/16 Inches and 2-7/16 Inches ABS Plastic for Dust Collector Systems 73455 : Automotive
Dust Collection Y-Connector for 4-inch Hose with 2-1/2 inch branch | Big Horn 11403
POWERTEC 4 in. to 2-1/2 in. Dust Collection Splitter Fitting 70276 - The Home Depot