Roto-molded riser lids from RotoSolutions are manufactured out of lightweight and durable polymers for easy handling and transport. They are sold with hardware kits that include stainless steel components. The lids are sold in boxes of six and are made to fit the 12-, 18- or 24-inch I.D. corrugated pipe. They can be filled with sand for added weight. 800/868-0973; www.rotosolutions.com.
