AV-254 Gelseal chemical grout from Avanti International is a hydrophilic urethane gel that quickly permeates various soils and cures to create an effective, long-lasting water barrier while providing soil stabilization. It stops water infiltration into manholes, sanitary and storm sewer mainlines, pipe joints, service laterals and other underground structures by providing support and strengthening surrounding soils. Typical injection techniques are probe or curtain grouting and by remote packer. It is easy to handle, nontoxic and nonflammable. The grout is typically pumped at an 8-1 water-to-resin ratio, but in injection areas with high water flow can be pumped without water. 800/877-2570; www.avantigrout.com.