Schedule 40 4-Way Slip x Slip x Slip x Slip - Bulk Reef Supply
PVC Pipeworks 1-1/2-in 90-Degree PVC Side Outlet Elbow Tee (4-Pack) in the PVC Pipe & Fittings department at Lowes.com
Formufit 1/2 in. Furniture Grade PVC 4-Way Tee in White (10-Pack) F0124WT-WH-10 - The Home Depot
Liaeyis 4-Way 1/2 inch PVC Pipe Fitting, 20PCS Elbow Fitting for Build PVC Furniture,Grade SCH40 4-Way PVC Elbow Side Outlet Tees,1/2" PVC Corner Elbow Fitting for Greenhouse Frame Tent Connections - Amazon.com
ANPTGHT 1-1/2“ Tee PVC Fitting 4 Way Elbow Connector, Furniture Grade 90 Degree Elbow Side Outlet, PVC Corner Fittings for Building Furniture Greenhouse Shed Pipe Fittings Tent Connection(Pack of 8) - Amazon.com
PVC FORTS 1/2 inch 4 Way Tee PVC Fitting Elbow Connector, White (1) - Amazon.com
FORMUFIT 1/2" 3-Way PVC Elbow Furniture Grade Fitting in Black, 0.84" Actual ID, (Pack of 10), Made In USA, UV-Resistant, Impact-Proof, Easily Build 3-Point Corners with PVC Pipe - F0123WE-BK-10: Amazon.com: Industrial