POWERTEC 70191 Screw End Quick Coupler, 2-1/4 x 2-1/2" Provides quick and easy connections between 2-1/4-Inch ports and 2-1/2-Inch flexible hoses Threaded end screws tightly into flexible hose Tapered end offers press-on attachment Ensures airtight connections in your dust-collection system network Tough, durable ABS plastic material