flow rack pipe and joints system-

Gravity Flow Rack systems using coated lean pipe and joints, accommodate everything from the fastest-movers to slow movers to odd-shaped cases, cartons, bins, or merchandise. You can store the same amount in half the space required by static shelving or racks and have first-in, first-out carton or tote access. http://www.alibaba.com//product-detail/JYJ-3-Four-Ports-Metal-Lean_884471308.html