NDS PVC S&D Increaser/Reducer Coupling, 3 in. Hub X 4 in. Hub 4P07 - The Home Depot
Charlotte Pipe 1-1/4 in. x 1 in. PVC Schedule 40 Reducer Bushing PVC 02112 2600HD - The Home Depot
Keeney 1-1/2-in Plastic Reducer Coupling in the Under Sink Plumbing department at Lowes.com
LASCO 1-1/4-in x 3/4-in Schedule 40 PVC Reducing Bushing at Lowes.com
PVC Reducer Coupling
FangKingNo 10pcs 1" male thread to 3/4" female thread Reducer Bushing for PVC Pipe Fittings Male to Female Threaded Adaptor for connecting pipe White (1"× 3/4", pack of 10) - Amazon.com
Amazon.com: FangKingNo 10PCS 1" 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 Inch to 3/4 Inch) :
Value Collection - 1 x 3/4″ PVC Plastic Pipe Reducing Coupling - 51260826 - MSC Industrial Supply