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 inflow/infiltration and provide corrosion protection at the grade adjustment ring or joint section. It provides an ideal 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.