Amazon.com: FangKingNo10pcs 3/4" White PVC Pipe Coupling Adapter Pipe Fittings (Slip to Slip) Schedule 40 Easy to Install,and High Tensile for Home or Industrial Use (1 Pack of 10pcs) (0.75 Inch) :
Pipe Fittings - PVC Couplings 3/4" Threaded
Fernco 1056-075 3/4-in. Flexible PVC Pipe Coupling for Plastic and Copper Plumbing Connections, Gray - Walmart.com