Amazon.com : NDS 6P07 4" by 6" Reducer Coupling Hub by Hub, Solvent Weld Fitting, White : Tools & Home Improvement
NDS 6-in PVC Sewer and Drain Coupling in the Sewage Pipe & Fittings department at Lowes.com
Charlotte Pipe 6-in PVC DWV Hub Coupling Fitting for Sanitary Drain, Waste, and Vent Applications in the PVC DWV Pipe & Fittings department at Lowes.com