Corrosion-resistant polyethylene septic tank risers from TOPP Industries eliminate the need to cut tubing from awkward lengths. Risers are available in 24- and 6-inch heights for bolt-on or concrete cast-in work. Six-inch septic tank riser extensions are also available. Risers and extensions are lightweight and UPS shippable. A fiberglass cover securely fits poly risers and extensions. The risers are easy to install, as they simply bolt into position or get concrete poured around the durable flanged base. They have tapered, lightweight construction for convenient stacking and reduced shipping costs. They have four built-in, recessed side pockets for easy handling of pipes and other penetrations. Installation mounting kits are available. 574/223-3681; www.toppindustries.com.