6" X 4" Duct Reducer & Increaser Non-Crimped Single Wall Galvanized Sheet Metal ducting Connector for Airflow, Heating, Cooling, & air Ventilation Systems Fittings - Ducting Components - Amazon.com
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6" x 3" Tri Clamp, Tri Clover, Sanitary, Concentric Reducer, 304 Stain – Affordable Distillery Equipment
BESTfit 6 To 4 Inch I.D.-O.D. X 8 Inch OAL Aluminized Steel Reducer Pipe - Elite Truck Accessories
Pipe Fittings Direct. 6 X 4 inch 316 Stainless Steel concentric reducers
6" X 4" Stainless Steel 304 Welding OD 159*102MM Sanitary Concentric Reducer | eBay