2~20PCS 1/2"3/4"1"Inch PVC Male/Female Thread Equal Path/Reducer/Bushing Joint Fish Tank Garden Irrigation Water Pipe Connectors - AliExpress
2" x 1-1/4" Sch 40 PVC Reducer Coupling Soc 429-250
Amazon.com: FangKingNo 10PCS 1/2" to 3/4" PVC Reducing Nipple Male Thread to Male Thread Coupling for PVC PIPE Pressure Fittings,PVC Male Adapter for PVC PIPE Connector White (1/2 Inch to 3/4 Inch) :
Charlotte Pipe 3/4-in x 1/2-in Schedule 80 PVC Reducing Bushing in the PVC Pipe & Fittings department at Lowes.com
Keeney 1-1/2-in Plastic Reducer Coupling in the Under Sink Plumbing department at Lowes.com