1.to provide an orthosis on any structure, and to create a frame. 2. To display items such as greenhouse products, frame, furniture, shelves, pool, and much more. 3.They are designed to withstand impacts, do not suffer from cracks or breakage. 4. PVC elbow fitting adopts high quality PVC furniture grade material, acid and alkali resistant, can withstand impact or drop from greater height without cracking or breaking. 5. Design: Three-way PVC pipe fittings are ideal for edge, corner and center connections;The ultra - deep sleeve allows the pipe to be further inserted into the fitting for a safer and firmer attachment, while the tapered end surface and sleeve structure design reduces friction and improves workability.