The Infi-Shield external seal from Sealing Systems prevents erosion and infiltration in manholes or catch basins. The one-piece molded seal is made from EPDM rubber and has a reinforced, preformed L-shaped corner. It is bonded with nonhardening butyl mastic and will pass a vacuum test. It installs easily in minutes without special tools. 800/478-2054; www.ssisealingsystems.com.