Reinforced concrete pipe from Oldcastle Precast, designed for stormwater transmission, can be manufactured to custom specifications. Sanitary liner systems are available. Circular pipes range from 15 to 48 inches I.D. and 19.5 to 58 inches O.D. Elliptical sizes include 12 by 18 inches (15-inch round equivalent), 14 by 23 (18-inch equivalent), 19 by 30 (24-inch equivalent), 24 by 38 (30-inch equivalent) and 29 by 45 (36-inch equivalent). 888/965-3227; www.oldcastleprecast.com/wastewater.