4" NDS or ADS pipe fits perfectly inside the 5" cover. If using the 6" cover, the pipe will be placed at the bottom, allowing 2" of aggregate to fill the remaining space.
Champion architectural grade, structural retaining wall drain components are designed to hide exposed drain pipes in large and small, residential and commercial retaining walls while providing optimum weeping of water in soil behind the wall system.
Champion Landscape Products
P.O. Box 11017 New Brunswick, NJ 08906