Flex-Seal Utility Sealant from Sealing Systems is a plural-component aromatic urethane with 800 percent elongation and a tensile strength of 3,200 psi. It is designed to prevent I&I and to provide corrosion protection at the grade adjustment ring section or joint section. It provides an excellent seal and will pass a vacuum test according to ASTM standards. The internal seal is manually applied using a paintbrush and the kit is designed to cover 12 vertical inches on a 27-inch-diameter manhole. 800-478-2054; www.ssisealingsystems.com.