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Amazon.com: CONNECTOR RIGHT ANGLE FOR SQUARE TUBE JOINT 2 WAY PIPE PROFILE PLASTIC 20MM 25MM 30MM 20x20 25x25 30x30 (A=20 x L=36 x L1=36 x t=1.5) : Industrial & Scientific
Steel Tube Connectors by Marni bemark, - ▻▻▻▻▻ STEEL TUBE CONNECTORS ◅◅◅◅◅ You can now build strong steel structures with 25mm square tubing without welding or expensive equipment. The perfect DIY product.
Amazon.com: Connector Right Angle for Square Tube Joint 3 Way Pipe Profile Plastic 20 25 30 MM 20x20 25x25 30x30 (20x1.5) : Industrial & Scientific
Round tube connector - Topclamp - YouTube
KIPP - Square tube connectors four-way with tapped hole