The Trenchless 90-Degree Elbow Spot Repair from Infrastructure Repair Systems was developed to seal joints, cracks or missing sections inside the 90-degree curve of any 4- to 6-inch pipe. It has a low-cost setup and is performed without bunching or wrinkling due to the liner’s flexible center and strong fiberglass design that expands on the outside and contracts to the pipe’s inner portion to ensure smooth, unobstructed curves. 877/327-4216; www.irsi.net.