Damage-resistant DuraFiber lids from Orenco Systems fit most ribbed PVC and HDPE riser pipes. The 11-pound, 24-inch-diameter non-skid lid (30-inch available) is made of resin-infused, UV-resistant fiberglass fabrics. It has a 20,000-pound breaking strength, flat-style flange for flush-to-grade installation, and cored centering ring for easy alignment and snug fit. Lids are available in standard green and three landscape patterns: grass, river rock and bark. 800/348-9843; www.orenco.com.