PVC Pipeworks 1/2-in Schedule 40 PVC Tee in White (10-Pack) in the PVC Pipe & Fittings department at Lowes.com
Bettomshin 5Pcs 3 Way Tee PVC Fittings, 0.98x0.98x0.79-Inch ID T-Shaped Connector, PVC Tee Pipe Fitting Adapter, Slip Fix Hold Corresponding Pipes White for DIY PVC Shelf Garden Support Storage Frame - Amazon.com
LASCO 1-in Schedule 40 PVC Tee at Lowes.com
1/2 in. Furniture Grade PVC Tee Fitting - White | FORMUFIT
Largest selection of common and unique PVC pipe fittings