The Valeron IL pre-liner for CIPP rehabilitation from Valeron Strength Films, a division of Illinois Tool Works, is designed to prevent water in the soil from entering the liner. It also shields the environment from non-cured resins used in the hardening process. The pre-liner can be inverted by pressurized air or pulled into place and is suitable for deviating (oval) pipe shapes. 800/825-3766; www.valeron.com.