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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) :
10Pack 1-1/2" PVC Pipe Coupling Adapter Pipe Fittings (Socket x Socket) Contractor Pack Schedule 40 Heavy Duty 1.50 Inch PVC Slip Socket Connectors for DIY PVC Shelf Garden Support Structure, White - Amazon.com