DURA 8 in. x 6 in. Schedule 40 PVC Reducer Bushing SPGxS 437-585 - The Home Depot
Charlotte Pipe 6 in. x 8 in. DWV PVC Pipe Increaser Reducer Bush PVC 00102 1900 - The Home Depot
8" x 6" PVC Duct Rolled Reducer Coupling, 1034-RCR-0806
8" x 6" Schedule 40 PVC Reducing Coupling, slip x slip 429-585
Vent Systems 8" to 6" Inch Duct Reducer Adapter Connector Fitting Pipe Increaser Reducer Cone for HVAC Ventilation Systems, ABS Plastic PVC Pipe 200 to 150 mm - Amazon.com
8" X 6" PVC SDR35 Gasket Joint Eccentric Reducer Coupling (G x G) - The Drainage Products Store
6 X 8 in SDR35 Solvent Weld Reducer | Plumbers Supply Co
6" x 8" Sch 40 PVC Reducing Male Adapter - Mipt x Soc 436-535F
8" x 6" PVC SDR35 Gasket Joint Reducer Bushing (Sp x G) - The Drainage Products Store
NDS PVC S&D Increaser/Reducer Coupling 4 in. Hub X 6 in. Hub | eBay
Charlotte Pipe + Foundry Co - 6 X 8 PVC-DWV Sch 40 Reducer Coupling HxH 102