Drain Cell for roof Garden 1.Easy for installation 2. High compressive strength ,Light weight,fast Drainage Drain CellDrain Cell is made of high ... used Brick as drainage , use cobblestone as Filter water, The Drain cell instead of cobblestones, save time to install, save labour , energy ... PS30HDPE/HIPS30350//18.20420SY-PE10HDPE10300300 6.40320SY-PE20HDPE20320 12.80420 Drain Cell for roof Garden