Roto-molded septic tank lids from RotoSolutions are manufactured from lightweight and durable materials for easy transport and handling during installation. They are sold with hardware kits that include stainless steel components. The lids are sold in boxes of six and are made to fit 12-, 18- or 24-inch I.D. corrugated pipe. They can be used with or without the sand filled option. 800/868-0973; www.rotosolutions.com.