Big Horn 11405 4 Inch x 2-1/2 Inch Two-Way Tube Coupler Adapter. Y-Adapter is used to branch off your dust collection line like a regular Y-adapter (connector), while reducing your branch offs down to 2-1/2-Inch. For best connection use hose clamp (not included).

Features:

• Attach branch lines to more than one machine
• Reduce your branch offs down to 2-1/2-Inchs
• Improves efficiency of your dust system
• Improves lateral air flow
• Dimensions: 9-1/2" L x 7-1/2" W    
• Y Openings: 2-1/2" OD
• Bottom of Y: 4" OD