A plurality of elongated channel like elements are formed for interconnection to each other and, through associated fittings into various configurations, for the purpose of conducting fluids from seeping wells, septic systems, and drains into leeching field arrangements. Each extension is open at its ends and is formed with a roof, apertured and spaced side walls, and inwardly extending but spaced flat horizontal legs so as to be open along its bottom and provides support so it does not sink int...