Bridge your 4" dust collection port to a 2.5" shop vacuum hose with a reducer engineered for airtight performance, precise sizing, and shop-grade durability. On one side, a flexible integrated rubber cuff (4" ID) slips over 4" OD tool ports to create a tight, leak-free seal that preserves airflow and suction. On the opposite side, the ABS reducer end is precisely sized at 2.511" OD and 2.277" ID to fit common 2.5" shop vacuum hoses and dust collection fittings. This adapter solves the most common workshop connection challenges—mismatched diameters, air leaks, and weak suction—by combining a compliant rubber cuff with a rigid ABS reducer. The included stainless steel hose clamp (3-1/2" to 4-3/8" adjustment range; 15/32" bandwidth) locks the connection securely under vibration and frequent tool changes, with no extra screws or specialty hardware required. Built for system expansion, this 4" to 2.5" reducer integrates seamlessly with 4" dust collection systems, blast gates, elbows, Y-fittings, and standard hoses. Ideal for table saws, jointers, planers, sanders, and CNC machines where you need to step down from a 4" port to a 2.5" shop vacuum hose without sacrificing an airtight seal. Key Specs & Fit: Cuff side: 4" ID integrated rubber cuff — fits 4" OD tool ports for an airtight seal ABS side: 2.511" OD / 2.277" ID — sized for 2.5" hose cuffs and dust fittings Clamp: Stainless steel, adjustable 3-1/2" to 4-3/8", 15/32" bandwidth Use cases: Connect 4" dust ports to 2.5" shop vacuum hoses across common woodworking tools