1 1/2" x 3/4" PVC Schedule 80 Eccentric Reducing Coupling (S x S) - The Drainage Products Store
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. PVC Schedule 40 Degree S x S Reducer Coupling PVC 02100 3400HD - The Home Depot