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) :
Schedule 40 PVC Pipe Slip x Slip x Slip x Slip Cross Fitting (1 1/2" Dia.) - 420-015 - - Amazon.com
436-030 3 MIPT x Slip Male Adapter PVC 40: Amazon.com: Industrial & Scientific