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) :
PVC Pressure Fittings 429-420 Reducing Coupling
2" IPS Compression Coupling - Hdpe Supply
2" PVC Compression Coupling | U.S. Plastic Corp.
Homewerks 511-43-1-1B 1 in. PVC Compression Repair Coupling - Walmart.com