Charlotte Pipe 3-in x 4-in PVC DWV Pipe Increaser Reducer in the PVC DWV Pipe & Fittings department at Lowes.com
PVC Male Adapter Pipe Fitting - SCH 40 PVC Fittings 3/4 Inch MNPT x 1 Inch Slip Socket PVC Connectors - PVC Pipe Connectors for Plumbing Water Line – Male Adapter Fitting - - Amazon.com