Amazon.com: White Sch 40 PVC Reducing Elbow - 3/4 Inch Slip Socket x 1/2 Inch Slip Socket PVC 90 Degree Elbow - PVC 90 Degree Elbow Reducer for Home Sewer Plumbing Water Line : Industrial & Scientific
PVC Elbow Reducer 1" Slip x 1/2" FPT
Blue 40mm x 40mm 90 Degree Equal Elbow PVC Pipe Slip Fitting Coupling 3 Pcs - AliExpress
Charlotte Pipe 4-in x 3-in PVC DWV Reducing Closet Elbow in the PVC DWV Pipe & Fittings department at Lowes.com