The most common of all the rectangular expansion joint options. The convolutions are butt welded together at each corner. These products allow for axial, lateral and angular deflections in your ducting systems. DME can build any number of unique sizes and shapes to meet your specific needs and in various in-stock stainless steel, high nickel and Corten alloys. Our 6000kW laser ensures that your end connections are cut precisely to fit up perfectly in the field. Flow liners can be installed to reduce back pressure, as can tie rods or limit rods to control movement. Give us a call to help you with your next square or rectangular expansion joint project!