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