Abstract: A joint connects one end of a tube to the side of a hollow member. It employs a pair of wedge elements that have sloping sides. A threaded fastener passes freely through a proximal wedge and then is threaded through a distal wedge. The fastener first passes through a hole in the side of the member and the wedges are inserted into the end of the tube. Tightening the fastener draws the wedges toward the member and causes the wedges to cooperate with one another to grip the inner surfaces of the tube to create a strong joint stable in many directions. Joints shown for tubes with various shapes.